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Confidence intervals
Page 5
Questions (715)
A) An insurance company wants to estimate the proportion of people unsatisfied with their new telephone help service. A survey
2 answers
asked by
Sam
585 views
Which of the following descriptions of confidence intervals is correct? (Select all that apply)
a. If a 95% confidence interval
3 answers
asked by
Lindsay
1,545 views
Can someone help me and let me know if what I have solved is correct.
A researcher randomly surveyed 300 high school seniors and
2 answers
asked by
Lindsay
689 views
A sample of fifteen 2-liter bottles of a soft drink delivers a mean weight of 2009 milliliters with a sample standard deviation
3 answers
asked by
carol
699 views
A random sample of 1000 people was chosen for a survey. 80% of them had health insurance. Find the 95% confidence interval.
1 answer
asked by
Abbie
394 views
A random sample of 5000 people was chosen for a survey. 54% of them said they didn't have children under 18 living at home. Find
1 answer
asked by
Anonymous
417 views
The average GRE score for math in a sample of students is 490. When you create a 95% confidence interval around this average,
2 answers
asked by
Anonymous
512 views
what is an confidence interval?
1 answer
asked by
Annie George
329 views
For questions 1- 5 use confidence intervals to test the hypothesis.
1) A light bulb producing company states that its lights will
1 answer
asked by
Rain
665 views
In a simple random sample of 90 patients who saw a certain dentist, 8 patients had their teeth whitened. What is the 95%
2 answers
asked by
sweet12
982 views
1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99%
2 answers
asked by
adrenning
740 views
FORMAT INSTRUCTIONS
Each question requires the use of MINITAB to solve. Please submit your work as a WORD or similar document.
2 answers
asked by
Amer
574 views
In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how
2 answers
asked by
Hunter
784 views
3. Determine the t-critical value for a two-sided confidence interval in each of the following situations.
a. Confidence level =
1 answer
asked by
Lizzie
684 views
2. Each of the following is a large-sample confidence interval for μ, the mean resonance frequency (HZ) for all tennis rackets
2 answers
asked by
Lizzie
576 views
Express the confidence interval (0.024, 0.112) in the form of p-hat – E < p < p-hat + E = __< p < __
I don't understand how to
1 answer
asked by
slomomo
472 views
A random sample of 20 people who resided within the u.s resulted in average viewing time of 4.76 hrs per day with a sample
2 answers
asked by
Anonymous
497 views
A recent poll of a random sample of 400 students at a public 4-year college showed the average (mean) amount of time spent using
2 answers
asked by
Anonymous
472 views
In a sample of 400 voters, 360 indicated they favor the incumbent governor. The 95% confidence interval? I can't figure out what
3 answers
asked by
Anonymous
2,266 views
The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval
2 answers
asked by
LADO
564 views
suppose x has a mound-shaped distribution. A random sample size 16 has a sample mean of 10 and a sample standard deviation of 2.
1 answer
asked by
Yira f
674 views
7) President’s job approval rating is frequently reported in news programs. You will hear statements such as: “Among likely
1 answer
asked by
EJ
451 views
b. A mobile company XYZ wants to conduct a survey to find the proportion P of those customers that are happy with the purchase
1 answer
asked by
aima
460 views
a. An independent random sample of 50 and 70 animals from two farmsshow the average animal weight to be 50 kg and 40 kg with
1 answer
asked by
aima
416 views
A research firm conducted a survey to determine the mean amount people spend at
a popular coffee shop during a week. They found
2 answers
asked by
Anonymous
1,100 views
1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of $35,000. Assume that
2 answers
asked by
Hugh
629 views
So i have a test in stats tomorrow and im trying to work on my study guide but im stuck at this question : Construct a
1 answer
asked by
Jessica
402 views
A random sample of 100 GMAT scores has a mean of 500. Assume that GMAT scores have a population standard deviation of 120.
2 answers
asked by
Lynn
532 views
Of 84 adults selected randomly from one town, 62 have health insurance. Find a 90% confidence interval for the true proportion
1 answer
asked by
Billy
782 views
Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2,
3 answers
asked by
Billy
2,333 views
To estimate the proportion p of defective light bulbs produced in a factory, a sample of 180 bulbs were tested. In this sample
1 answer
asked by
Anonymous
684 views
Certain data includes 36 body temperatures for which the sample mean is equal to 98.20 °F and standard deviation of 0.62 °F.
2 answers
asked by
statitics
509 views
Emilio has played ten rounds of golf this season. His mean score is 80 and standard deviation is 4. Assume Emilio's golf scores
1 answer
asked by
Caroline
654 views
A simple random sample of 60 items resulted in a sample mean of 96. The population standard deviation is 16.
a. Compute the 95%
3 answers
asked by
Mia
1,699 views
The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a
4 answers
asked by
Mia
3,111 views
Of 43 bank customers depositing a check, 18 received some cash back. (a) Construct a 90 percent confidence interval for the
1 answer
asked by
Kevin
798 views
the average placement test score of a sample of 64 students out of 1000 registered at a community college is 70 with a standard
2 answers
asked by
D
1,207 views
A researcher plans to use a random sample of n= 500 families to estimate the mean monthly family incomefor a large population. a
4 answers
asked by
Deedy
1,278 views
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time
1 answer
asked by
Steven
398 views
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time
1 answer
asked by
Steven
411 views
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time
1 answer
asked by
Steven
409 views
The body temperature of healthy human beings can be assumed to have a normal distribution with mean and standard deviation
1 answer
asked by
Steven
438 views
Salaries of 31 college graduates who took
a course in college have a mean, x of 66,700 a standard deviation , o of 17,120,
2 answers
asked by
anonymous
563 views
A bank is testing a new method for getting delinquent customers to pay their past-due credit card bills. The standard way was to
3 answers
asked by
Lisa
857 views
Pye and Associates recently conducted a survey to determine the percent of adult county residents who believe that students in
5 answers
asked by
Michael
697 views
A newspaper article states with 95% confidence that 58% to 62% of all high school juniors and seniors in the United States claim
3 answers
asked anonymously
40 views
The 95% confidence interval for the proportion of all high school students who had smoked cigarettes in the past year, was found
3 answers
asked anonymously
63 views
random sample of 50 four year olds attending daycare centers provided a yearly tuition average of 3987$ and the population
2 answers
asked by
Anonymous
515 views
2. The population standard deviation for the number of rolls before a 1 is observed. Use this result to construct a 90%
1 answer
asked by
Me
334 views
5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary
2 answers
asked by
James
650 views
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