The average time taken by a sample of 68 runners to complete a 10km race was...
The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a population standard deviation of 8.65 minutes, construct a 99% confidence interval for the true average time taken by all runners to complete the race. Interpret your answer. (6)
|
Confidence Level |
Z - Limits |
|
90% |
± 1.645 |
|
95% |
±1.96 |
|
99% |
±2.58 |
Homework Answers
Add Answer to:
The average time taken by a
sample of 68 runners to complete a 10km race was...
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of...
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of 30 female runners. Training Times (in minutes) of Female Runners 8 99 Key: 17 8 = 178 18 0 0 0 0 1 2 3 4 6 6 7 9 19 0 0 0 3 4 5 5 6 6 20 0 0 1 2 3 Provided the data from the stem-and-leaf plot above answer the following questions. 1 a) Use the sample to...
Single Sample t-Test Coach Brown is training his runners for an upcoming race, but he is...
Single Sample t-Test Coach Brown is training his runners for an upcoming race, but he is concerned about their pace. He takes down sample times from his top 7 runners to compare it to his all-time standard race speed of 7.9 minutes per kilometer (μ). The sample times from his runners were 8.55 minutes per kilometer (M) with a standard deviation estimate of 0.78 (s). Based on this data, complete the six steps of hypothesis testing given that our research...
Out of 500 people sampled, 450 had kids. Based on this, construct a 95% confidence interval...
Out of 500 people sampled, 450 had kids. Based on this, construct a 95% confidence interval for the true population proportion of people with kids. Do not use StatCrunch. Show all formulas used, work and steps. Be sure to define your variables. As in the reading, in your calculations: --Use z = 1.645 for a 90% confidence interval --Use z = 1.96 for a 95% confidence interval --Use z = 2.576 for a 99% confidence interval Give your answer in...
help please :) Single Sample t-Test Coach Brown is training his runners for an upcoming race,...
help please :)
Single Sample t-Test Coach Brown is training his runners for an upcoming race, but he is concerned about their pace He takes down sample times from his top 7 runners to compare it to his all-time standard race speed of 7.9 minutes per kilometer (). The sample times from his runners were 8.55 minutes per kilometer (M) with a standard deviation estimate of 0.78 (s). Based on this data, complete the six steps of hypothesis testing given...
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of...
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of 30 female runners. Training Times (in minutes) of Female Runners 17 8 9 9 Key: 17 8 = 178 18 0 0 0 0 1 2 3 4 6 6 7 9 19 0 0 0 1 3 4 5 5 6 6 20 0 0 0 1 2 3 Provided the data from the stem-and-leaf plot above answer the following questions. a) Use...
In a random sample of 29 people, the mean commute time to work was 323 minutes...
In a random sample of 29 people, the mean commute time to work was 323 minutes and the standard deviation was 72 minutes. Assume the population is normally distributed and use at distribution to construct a 99% confidence interval for the population mean . What is the margin of error of u? Interpret the results The confidence interval for the population MAAN (Round to ona decimal ACA 2 neded) D The margin of error of his (Round to ona decimal...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of time the customers in the sample stayed in the restaurant was 45 minutes with a standard deviation of 14 minutes. a. Compute the standard error of the mean. b. Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant. c. With a .99 probability, how large of a sample would have to be taken to provide a...
A random sample of 49 cherry shop customers was taken. The sample’s mean amount of time...
A random sample of 49 cherry shop customers was taken. The sample’s mean amount of time these cus-tomers stayed in the shop was 30 minutes with a sample standard deviation of 10 minutes. Develop a 95% confidence interval estimate for the mean of the population by answering this a) What is the margin of error? b) What is the confidence interval? c) Interpret your answer
In a random sample of 17 people, the mean commute time to work was 30.7 minutes and the standard deviation was 7.3 minutes
In a random sample of 17 people, the mean commute time to work was 30.7 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 95% confidence interval for the population mean μ. What is the margin of error of μ? Interpret the results. The confidence interval for the population mean μ is _______ . The margin of error of μ is _______ .Interpret the results A. With 96% confidence, it can...
random sample of 16 observations was taken from a normally distributed population. The average in the...
random sample of 16 observations was taken from a normally distributed population. The average in the sample was 80 with a variance of 144. a Construct a 90% confidence interval for 1. b. Construct a 99% confidence interval for . c. Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part a if the sample size was increased? Be sure to explain your answer d.
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of 30 female runners. Training Times (in minutes) of Female Runners 8 99 Key: 17 8 = 178 18 0 0 0 0 1 2 3 4 6 6 7 9 19 0 0 0 3 4 5 5 6 6 20 0 0 1 2 3 Provided the data from the stem-and-leaf plot above answer the following questions. 1 a) Use the sample to...
help please :)
Single Sample t-Test Coach Brown is training his runners for an upcoming race, but he is concerned about their pace He takes down sample times from his top 7 runners to compare it to his all-time standard race speed of 7.9 minutes per kilometer (). The sample times from his runners were 8.55 minutes per kilometer (M) with a standard deviation estimate of 0.78 (s). Based on this data, complete the six steps of hypothesis testing given...
The stem-and-leaf plot below shows the marathon training times (in minutes) for a random sample of 30 female runners. Training Times (in minutes) of Female Runners 17 8 9 9 Key: 17 8 = 178 18 0 0 0 0 1 2 3 4 6 6 7 9 19 0 0 0 1 3 4 5 5 6 6 20 0 0 0 1 2 3 Provided the data from the stem-and-leaf plot above answer the following questions. a) Use...
In a random sample of 29 people, the mean commute time to work was 323 minutes and the standard deviation was 72 minutes. Assume the population is normally distributed and use at distribution to construct a 99% confidence interval for the population mean . What is the margin of error of u? Interpret the results The confidence interval for the population MAAN (Round to ona decimal ACA 2 neded) D The margin of error of his (Round to ona decimal...
random sample of 16 observations was taken from a normally distributed population. The average in the sample was 80 with a variance of 144. a Construct a 90% confidence interval for 1. b. Construct a 99% confidence interval for . c. Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part a if the sample size was increased? Be sure to explain your answer d.
Most questions answered within 3 hours.
-
Linear programming is an excellent technique yet is not applied
nearly enough in the “real world.”...
asked 6 minutes ago -
What three alkenes yield 3-methylpentane on catalytic
hydrogenation?
asked 6 minutes ago -
In JAVA Create a program with an array with the following
data:
50 12 31 76...
asked 9 minutes ago -
Using a hormone of the hypothalamic-anterior pituitary axis,
describe or diagram how negative feedback loops regulate...
asked 7 minutes ago -
1,1-dimethylcyclorohexane reacts with single bromine atom
asked 30 minutes ago -
The completed Lewis structure of CO2 contains a total
of 0,1,2,3,4,5,6,7,8 covalent bonds
and 0,1,2,3,4,5,6,7,8 lone pairs.
NOTE:...
asked 37 minutes ago -
A 0.0510 M solution of an organic acid has an
[H+] of 7.50×10-4M .
What is...
asked 34 minutes ago -
what is the profit-maximizing output condition that a
monopolistically competitive firm must satisfy? a) price charged...
asked 38 minutes ago -
Consider the set of ordered pairs shown below. Assuming that the
regression equation is y=3.513+0.429x and...
asked 59 minutes ago -
1. (A) Write two
structural (constitutional)
isomers of C4H8F2?
Please show all of
the
asked 1 hour ago -
Objective: Practice converting a Boolean logic
expression into it’s truth table and to show the implementation...
asked 59 minutes ago -
1) Name the three holes located in the greater wing of the
sphenoid bone in order...
asked 1 hour ago