A fitness center is interested in finding a 90% confidence interval for the mean number of daysper week that Americans who are members of a fitness club go to their fitness center. Records of268 members were looked at and their mean number of visits per week was 2.1 and the standarddeviation was 1.8. Round answers to 3 decimal places where possible.a. To compute the confidence interval use a? 9 distribution.b. With 90% confidence the population mean number of visits per week is betweenandvisits.c. If many groups of 268 randomly selected members are studied, then a different confidenceinterval would be produced from each group. Aboutpercent of these confidenceintervals will contain the true population mean number of visits per week and aboutpercent will not contain the true population mean number of visits per week.

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Answered: A fitness center is interested in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 273 members were looked at and their mean number of visits per week was 3.5 and the standard deviation was 1.9. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a Correct distribution. b. With 90% confidence the population mean number of visits per week is between and visits. c. If many groups of 273 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week.
In a survey, 19 people were asked how much they spent on their child's lost birthday gift. The results were roughly bellshaped with a mean of $46 and standard deviation of $8. Construct a confidence Interval at a 99% confidence level Give your answers to one decimal place:
a. interpret the corresponding 95% confidence intervals for both Birth weight and Age. b. What is the predicted average SBP of an infant born with birth weight 8lbs (128oz) measured at 3 days old? c. Calculate the Pearson correlation between Age and Birth weight, and test if this correlation is significant at the 0.05 level. Does this answer surprise you, why or why not?
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A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 249 members were looked at and their mean number of visits per week was 2.2 and the standard deviation was 2.7. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 90% confidence the population mean number of visits per week is between and visits. c. If many groups of 249 randomly selected members are studied, then a different confidence percent of these confidence interval would be produced from each group. About intervals will contain the true population mean number of visits per week and about percent will not contain the true population mean number of visits per week.
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A professor was curious about her students' grade point averages. She took a random sample of 15 students and found a mean GPA of 3.01 with a standard deviation of 0.534. Which of the following formulas gives a 99% confidence interval for the mean GPA of the professor's students?
Please help with 6 a-b
A random sample of 64 shoppers showed that they spend an average of $27.31 per visit at the Sunday Mornings Bookstore. The standard deviation of the population is $2.14. Find the 90% confidence interval of the true mean. Please include all work showing how you found your answer.
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A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 228 members were looked at and their mean number of visits per week was 3.1 and the standard deviation was 2.8. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 90% confidence the population mean number of visits per week is between ? and ? visits. c. If many groups of 228 randomly selected members are studied, then a different confidence interval would be produced from each group. About ? percent of these confidence intervals will contain the true population mean number of visits per week and about ? percent will not contain the true population mean number of visits per week.
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