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Which of the following statements is true about the t-distribution with k degrees of freedom?
i. the t-distribution is symmetric
4 answers
asked by
Anonymous
9,361 views
If you test the (one sample) null hypothesis that the population proportion p ¡Ü 0.3 and you get the test statistic value of z
4 answers
asked by
Anonymous
934 views
about 35% of a population has blue eyes if four different people are randomly selected what is the probability that they all
4 answers
asked by
Anonymous
2,549 views
A college basketball player scored the following points in the 37 games he played his senior year:
Stem-and-leaf of points n = 37
4 answers
asked by
paul
2,427 views
if the heights of men follow a normal distribution, and 99.7% fall between 5" and 7" what is the estimate standard deviation of
4 answers
asked by
lena
2,361 views
for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly
4 answers
asked by
carl
4,376 views
The heights of young American women, in inches, are normally distributed with mean mu and standard deviation 2.4 (sigma). I
3 answers
asked by
kim
3,123 views
Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval.
A researcher
3 answers
asked by
jim
610 views
A researcher at a major clinic wishes to estimate the proportion of the adult population of the US that has sleep deprivation.
3 answers
asked by
SD
1,504 views
One of the questions on a survey of 1,000 adults asked if today's children will be better off than their parents (Rasmussen
3 answers
asked by
Anonymous
3,377 views
the average number of pushups a United States Marine does daily is 300, with a standard deviation of 50. A random sample of 36
2 answers
asked by
Anonymous
1,921 views
is this statement true?
Hypothesis tests are dsigned to measure the amount of evidence that exists against the alternative
1 answer
asked by
Anonymous
570 views
ok there was a question that my teacher told me i got wrong
the question asked me to compute the mean which I did... then the
2 answers
asked by
stat
1,089 views
Standard deviation for the following sets
and compare the differences. first 7 #'s 57 61 57 57 58 57 61 second 7#'s 61 52 69 64
1 answer
asked by
Dannette Fulcher
800 views
a machine has 7 identical components which function independently. the probability that a component will fail is 0.2. the
1 answer
asked by
anonymous
497 views
please help!! pretty please!!
i need to know how to this problem ASAP! suppose you pay $1.00 to roll a fair die with the
1 answer
asked by
anonymous
457 views
An employer wants to set a time limit so that 75% of the employees will finish a job on time. Past history has shown that the
2 answers
asked by
Anonymous
534 views
A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question
3 answers
asked by
laura
1,230 views
I posted a question but never got an answer.
1 answer
asked by
jackie
266 views
Microbes in a certain colony exposed to radiation have a 1=6 chance of being
mutated. a. If ten microbes from the colony are
1 answer
asked by
jack
324 views
a sample of 150 adults is composed of 100 women and 50 men. estimate the standard error of the proportion for the female
2 answers
asked by
suzanne
968 views
A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and
distribution
3 answers
asked by
Anonymous
1,917 views
a credit card company estimated that 62% if its customers are males. The company is considering a randomly selected sample of
1 answer
asked by
tanya
432 views
1. The MBA department is concerned that dual degree students may be receiving lower grades
than the regular MBA students. Two
1 answer
asked by
jeen
499 views
1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. A sample of
3 answers
asked by
Anonymous
844 views
7. A researcher selects a random sample. A 90% confidence interval for a population mean
A) is an interval with margin of
3 answers
asked by
Anonymous
1,605 views
Draw a vertical line through a normal distribution for each of the following z- score locations. Determine whether the body is
2 answers
asked by
Anonymous
724 views
given an exponential distribution with mean = 30 what is the probability that the arrival time is a) less than X = 0.1 B)
2 answers
asked by
charles
509 views
the time between unplanned shutdowns of a power plant has an exponential distribution with a mean of 20 days. Find the
2 answers
asked by
charles
815 views
McDonald Corporation wishes to estimate the average annual sales at its various McDonald
Restaurants for the current year, �(y).
1 answer
asked by
Anonymous
405 views
Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth.
x: 23 17 12 35 29
1 answer
asked by
jackie
410 views
Musical styles other than rock and pop are becoming more popular. A survey of college students finds that 34% like country
1 answer
asked by
may
833 views
Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. Suppose that
2 answers
asked by
ahmed
1,318 views
a
how to solve the problem when on 100 point examination with mean 60, SD 10, if there are 5% A, 5% F, 15% B, 15% D, and 60% C,
1 answer
asked by
B
320 views
A company’s CEO wanted to estimate the percentage of defective product per shipment. In a sample containing 500 products, he
1 answer
asked by
me,me
362 views
The average commute time via train from the Chicago O'Hare Airport to downtown is 60 minutes with a standard deviation of 15
3 answers
asked by
des
639 views
The life (in hours) of a computer processing unit (CPU) is modeled as a weibull random variable with β=3 and α=901 hours. What
1 answer
asked by
eliseo
1,197 views
Assume that the population of heights of female college students is approximately normally distributed with mean m of 67.26
1 answer
asked by
tina
462 views
the number of mosquitoes that brown bats can eat in an hour has a mean of 600 and a standard deviation of 200. a study observed
2 answers
asked by
Jeanie
1,060 views
A survey was conducted to study the relationship between the annual income of a family and the amount of money the family spends
4 answers
asked by
Divine
1,893 views
When a confidence interval for a population proportion is constructed for a sample size n = 100 and the value of, p = .4 the
2 answers
asked by
Anonymous
537 views
In a certain high school, the probability that a student drops out is 0.08, and the probability that a dropout gets a
4 answers
asked by
shan
2,536 views
What is the probability of getting a license plate that has a repeated letter or digit if you live in a state that has four
1 answer
asked by
d's
386 views
A MAIL-ORDER FIRM HAS A CIRCULAR WHICH ELICITS A 10 % RESPONSE RATE. SUPPOSE 20 OF THE CIRCULARS ARE MAILED AS A MARKET TEST IN
1 answer
asked by
siddhi
620 views
Problem 2.
THE PROBABILITY THAT A RANDOMLY CHOSEN SALES PROSPECT WILL MAKE A PURCHASE IS 0.20. IF A SALESMAN CALLS ON SIX
2 answers
asked by
siddhi
2,406 views
The total area under the normal distribution curve is equal to a probability of____
1 answer
asked by
Nichole
409 views
assume that the heights of men are normally distributed with a mean of 68.4 inches and a standard deviation of 2.8 inches.if 64
3 answers
asked by
veedu
2,299 views
if the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be
4 answers
asked by
veedu
1,750 views
Three coins are tossed, and the number of heads observed is recorded. (Give your answers as fractions.)
(a) Find the probability
1 answer
asked by
jilla
690 views
Find the area under the standard normal curve to the left of z = 1.88, P(z < 1.88). (Give your answer correct to four decimal
4 answers
asked by
janet
1,881 views
Help my name is Gee and i have posted several question on and ive waited for help and no one will answer can someone please
1 answer
asked by
Gee
388 views
AluminiCorp is a major producer of aluminum cans that produces 40 billion aluminum cans every year. You work as a quality
2 answers
asked by
Anonymous
841 views
the process that produces sonora bars a type of candy is intended to pduce bars with a mean weight of 56 gm. The process
3 answers
asked by
christopher
1,089 views
A sample consists of the following data 7,11,12,18,20,22,25. What is the sample variance?
4 answers
asked by
christopher
1,380 views
Explain why using the t statistic may be an appropriate alternative to using a z-score
2 answers
asked by
Tracy
806 views
200 tickets are sold to a raffle. It costs $5 to buy a ticket. There is one first prize winner and one second prize winner.
2 answers
asked by
Kudu
536 views
A set of n = 5 pairs of X and Y values has SX = 10, SY = 20, and SXY = 10. For this set of scores, what is the value of SP?
2 answers
asked by
andrea
748 views
When rolling a die, is this an example of a discrete or continuous random variable?
1 answer
asked by
Bruce
390 views
An oil change company advertises that they can change the oil in your car in 15 minutes. Based on the data collected below, what
1 answer
asked by
latasha
428 views
The general population (Population 2) has a mean of 30 and a standard deviation of 5, and the cutoff Z score for significance in
4 answers
asked by
Jaky
1,868 views
Given the Variable X measured at a Nominal Level, what descriptive statistical indice would you give if asked to provide the
4 answers
asked by
Anonymous
1,270 views
couple plans to have four children what is the probability that three are girls and one is a boy
3 answers
asked by
jerry
800 views
EXERCISE: THE MULTIPLICATION RULE (4 points possible)
Are the following statements true or false? (Assume that all conditioning
2 answers
asked by
vlad
1,092 views
A physician routinely makes physical examinations of children. She is concerned that a three-year-old girl has a height of only
2 answers
asked by
melissa
887 views
only 65% of climbers reach the summit, a random sample of 16 climbers what is the probability that(A) all 16 reach (B) at least
1 answer
asked by
doris
346 views
it is estimated that 17% of americans have blue eyes. A random sample of 9 americans is selected. Find the probability that the
2 answers
asked by
Anonymous
667 views
You wanted to test whether the cereal boxes made by your plant conform to the requirement that they contain 12 oz cereal. You
2 answers
asked by
Namonje
528 views
The emission of 10 engines is found to be:
15.6, 16.2, 22.5, 20.5, 16.4, 19.4, 16.6, 17.9, 12.9, 13.9. The mean emission must,
1 answer
asked by
Nandy
350 views
A sample of comprising 150 members is required from a population comprising 5000 members. It is known that the population falls
1 answer
asked by
Nandy
496 views
The ministry of transport and communication is responsible for the enforcement of airline safety regulations and has become
1 answer
asked by
LwEeNdO
450 views
According to 2010 UCR data, Oakland, CA has a murder rate of 22.0 (per 100,000) in 6th place, Washington, DC has a murder rate
2 answers
asked by
tavia
940 views
Drawing a spade form a regular deck of playing cards and then drawing another spade from the same deck without replacing the
1 answer
asked by
Anonymous
460 views
a full scholarship to any student who scores in the top 4% of students on the SMRT standardized exam. SMRT scores have a mean of
1 answer
asked by
Barb
404 views
2. You just bought a used truck for $10,000 and it loses value at a rate of 10% per year. What is it worth two years later?
1 answer
asked by
jeudi
379 views
Diana and franklin both play a card game called cribbage,in whichthe first person to earn 121 points is the winner. The table
2 answers
asked by
destiny
793 views
Assume that the table below represents the distribution of X. Note that X is a discrete random variable. The second column
1 answer
asked by
ashley
469 views
The mean of a normal probability distribution is 60; the standard deviation is 5
4 answers
asked by
george
1,447 views
Construct a 90% confidence interval for the population mean. Assume the population has a normal distribution. A same of 15
4 answers
asked by
S
3,128 views
Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation
2 answers
asked by
Albert
859 views
While technology or a t-distribution Distribution Table can be used to find the area, in this problem, technology will
1 answer
asked by
Justin
633 views
A poll of 1000 registered voters reveals that 480 of the voters surveyed prefer the Democratic candidate for the presidency. At
2 answers
asked by
Joe
511 views
A poll of 1000 registered voters reveals that 480 of the voters surveyed prefer the Democratic candidate for the presidency. At
1 answer
asked by
Joe
459 views
A contract employs three types- Class A , Class B and class c. to class A workers, he pays an average monthly salary of $ 400,
1 answer
asked by
moon
688 views
You take a trip by air that involves three independent flights. If there is an 72 percent chance each specific leg of the trip
3 answers
asked by
ashley
834 views
let x and y be continuous random variables having joint density f(xy)=a^2 e^-ay, 0<=X<=Y.
Find the marginal densities of X an Y.
1 answer
asked by
Daminda
385 views
smith is a weld inspector at a ship yard. he knows from keeping track of good and substandard welds that for the afternoon shift
3 answers
asked by
tammy
2,005 views
** I already finish these questions
Can you answer so I can compare my final answers w/ yours.** Suppose that a principal of a
2 answers
asked by
Crystal
670 views
A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she
1 answer
asked by
mike
797 views
three boxes contains 12 electric bulbs in each one box(1) contains 4 defective bulbs box (2) contains 3 defectives bulbs Box (3)
1 answer
asked by
N
635 views
In an extensive study involving thousands of British children, Arden and Plomin (2006) found
significantly higher variance in the
1 answer
asked by
jessie
745 views
In a random sample of 200 registered voters, 150 indicated they are Democrats. Develop a 99% confidence interval for the
2 answers
asked by
nancy
669 views
the probability that a student pass a test in statistics is 2/3, and the probability that both a test in statistics and
4 answers
asked by
henok
1,258 views
wolf has an average weight of 44 lbs. with a standard deviation of 3 lbs. what percent of wolves weigh under 40 lbs.?
2 answers
asked by
Anonymous
517 views
Use table A - 2 to find the probability of a randomly selected value is between 0.7 and 1.98.
1 answer
asked by
Josh
363 views
A 95% confidence interval for a difference in proportions p1-p2 if the samples have n1=70 with p^1=0.64 and n2=90 with p^2=0.58,
2 answers
asked by
Anonymous
522 views
Zima, a clear malt beverage from the 90s produced by the Coors Brewing Company, came in 12-ounce bottles. In the manufacturing
1 answer
asked by
monica
231 views
What is the difference between a frequency polygon and an ogive?
1 answer
asked by
Anonymous
50 views