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Confidence intervals
Page 8
Questions (715)
Th weekly salaries of a sample of 100 recent graduates of a private women's college are normally distributed with a mean of $600
2 answers
asked by
Mary
492 views
Recovery times for patients on an exerciser for people with chronic lower back pain are normally distributed; a random sample of
3 answers
asked anonymously
39 views
You plan to conduct a political poll of people in Berkeley, asking whether people prefer apples (A) or bananas (B). You have
1 answer
asked by
Anonymous
452 views
A confidence intervel has a width of 50 units.
If the sample mean is 100, The lower bound of the intervel is?
1 answer
asked by
Tony
311 views
Think I know the answer, but can someone please confirm...
Find the value of a that corresponds to a confidence level of 84%.
5 answers
asked by
Cassy
511 views
Given a normally distributed population, find a 95% confidence interval for the population mean;
sample mean is 119; sample std
2 answers
asked by
Marilyn
538 views
I have the following two multiple choice questions that are really throwing me for a loop:
1. Based on 500 people a researcher
2 answers
asked by
Joanne
607 views
I'm having some difficulty with this problem:
Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the
3 answers
asked by
melanie
648 views
Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the American League leader is 258.5. Assuming that
1 answer
asked by
melanie
446 views
Over the last 15 Major League Baseball seasons, the mean number of strikeouts by the American League leader is 258.5. Assuming
1 answer
asked by
melanie
874 views
Significance Test and Confidence Intervals In General:
The article contains a 95% confidence interval. Would the margin of error
2 answers
asked by
Carma
675 views
Two Sample Population Confidence Interval:
Before an intensive TV advertising campaign, the producers of Nike athletic shoes find
2 answers
asked by
Carma
519 views
Confidence Intervals and Errors:
An opinion poll asks 1500 randomly chosen United States residents their opinions about relations
1 answer
asked by
Carma
499 views
An accounting firm recently stated:
"The client's mean sales per customer is estimated to be between $14.50 and $28.50. Further
1 answer
asked by
Huntsville33
420 views
I am having problems in this course with following the professor. Can anyone help me with this problem Thanks
need to calculate
1 answer
asked by
Grace
466 views
Suppose that, based on a simple random sample of n = 100 American adult men, we wish to calculate a 98% confidence interval for
1 answer
asked anonymously
45 views
Suppose that we wish to estimate the population mean grade-point average (GPA) across all UVA undergraduate students. From a
1 answer
asked anonymously
44 views
Suppose you do a study of meditation to determine how effective it is in relieving pain. Sensory rates are measured for the
1 answer
asked anonymously
34 views
A recent study of 750 zombies in Europe found that 35% of zombies were women. What is the 95% confidence interval of the true
1 answer
asked anonymously
36 views
Which type of confidence interval should you use in this situation? A sample of 6 adult elephants had an average weight of
1 answer
asked anonymously
39 views
Which type of confidence interval should you use in this situation? A sample of 400 racing cars showed that 80 cars cost over
1 answer
asked anonymously
46 views
Which type of confidence interval should you use in this situation? A sample of 25 different payroll departments found that the
1 answer
asked anonymously
38 views
What is the critical t-value (found in the t-table) if you are making a 90% confidence interval with a sample size of 20?
1 answer
asked anonymously
16 views
Find the critical value za/2 that corresponds to the given confidence level.
96%
4 answers
asked by
Kasey
4,312 views
Compute the critical value za/2 that corresponds to a 85% level of confidence.
4 answers
asked by
Kasey
3,304 views
Express the confidence interval (0.033,0.099) in the form of P-E<p<P+E
3 answers
asked by
Nina
2,338 views
Suppose a new treatment for a certain disease is given to a sample of n=200 patients. The treatment was successful for 166 of
4 answers
asked by
Kya
2,342 views
You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the
3 answers
asked by
alex
2,130 views
An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure
3 answers
asked by
Shavela
1,904 views
3. A telephone company wants to estimate the porportion of households that would purchase an additional service line if it were
4 answers
asked by
Anonymous
1,818 views
a random sample of 42 college graduates who worked during their program revealed that a student spent an averge of 5.5 yeas on
4 answers
asked by
Dalila
1,808 views
A biologist reports a confidence interval of (3, 2, 3, 8) when estimating the mean height in (in centimeters) of a sample of
3 answers
asked by
kathy
1,764 views
A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard
4 answers
asked by
Paula
1,681 views
Dylan wants to determine a 90 percent confidence interval for the true proportion of high school students in the area who attend
3 answers
asked by
fm
1,670 views
A random sample of size 15 taken from normally distributed population revealed a sample mean of 75 and a sampl variance of 25.
4 answers
asked by
S
1,642 views
Direct mail advertisers send solicitations (a.k.a. "junk mail") to thousands of potential customers in the hope that some will
3 answers
asked by
MeSue
1,614 views
An SRS of 40 San Diego County Schools graduates showed that 26 of the 40 enrolled in a college or university right out of high
3 answers
asked by
Anonymous
1,604 views
Find the critical value zc necessary to form a confidence interval at the given level of confidence.
a. 90% = 1.645 b. 85% =
3 answers
asked by
looking for someone to varify my work please
1,596 views
A random sample of 42 college graduates revealed that they worked an average of 5.5 years on the job before being promoted. The
4 answers
asked by
Jim
1,593 views
Direct mail advertisers send solicitations (that is "junk mail") to thousands of potential customers in the hope that some will
4 answers
asked by
Nick
1,516 views
In a preliminary study, the sample standard deviation for the duration of a particular
back pain suffered by patients was 18.0
3 answers
asked by
joe
1,478 views
The number of grams of carbohydrates in a 12-ounce serving of a regular soft drink is listed here for a random sample of sodas.
3 answers
asked by
Carolyn
1,475 views
A researcher wants to estimate the proportion of a population which possesses a given characteristic. A random sample of size
4 answers
asked by
John
1,475 views
A sample of 106 body temperatures resulted in a mean of 98.2 degrees and a standard deviation of .62 degrees. Use these sample
3 answers
asked by
Elizabeth
1,454 views
How heavy a load (pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Here are data from
3 answers
asked by
Yesenia
1,454 views
You measure 34 turtles' weights, and find they have a mean weight of 66 ounces. Assume the population standard deviation is 9.3
3 answers
asked by
Livia
1,447 views
Find the critical value za/2 that corresponds to the given confidence level.
96% za/2=
3 answers
asked by
Anonymous
1,437 views
You wish to estimate the population mean emergency room wait time (in minutes) at UVA hospital. From a random sample of 1,000
4 answers
asked anonymously
47 views
Suppose you instead wish to calculate a 90% confidence interval for the population for the population mean using the same sample
1 answer
asked anonymously
63 views
Suppose that, based on a simple random sample of n=50 English Premier League soccer matches, we wish to calculate a 94%
4 answers
asked anonymously
41 views
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