17) A store manager claims that the standard deviation of the number of customers per day...
17) A store manager claims that the standard deviation of the number of customers per day is more than 8. A random sample of 51 days has a mean number of customers 498 with a standard deviation 8.2. Test the claim using a 0.05 level of significance.
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17) A store manager claims that the standard deviation of the
number of customers per day...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
A local hardware store claims that the mean waiting time in line is less than 3.5...
A local hardware store claims that the mean waiting time in line is less than 3.5 minutes. A random sample of 20 customers has a mean of 3.3 minutes with a standard deviation of 0.8 minute. If a = 0.05, test the store's claim. Assumption: ? Parameter: ? Hypothesis: ? Test Statistic: ? Reject- Region: ? Calculated Test Statistic: ? Conclusion: ? P-value: ?
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and al...
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and all work for each hypothesis test. Be sure you select the correct test to use for each problem. 1. A telephone company claims that less than 30% of all college students have a limited number of text messages per month. A random sample of 150 students revealed that 41 of them have a limited number. Test the company's claim at the 0.01 level of...
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers....
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 55 minutes and the sample standard deviation was 2 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 5 minutes The hypothesis to test the manager's concern is: Hops 5, Ha>5 The test statistic is a...
A Pizza Hut store manager believes that the average number of customers who return a pizza...
A Pizza Hut store manager believes that the average number of customers who return a pizza or ask for a refund is 20 per day. The store records the number of returns and exchanges for the 25 days it was open during a given month. Are the returns different than 20 per day? Sample mean= 25, s=5, n=25. Test at α = .01. H0: µ = 20 H1: µ ≠ 20 interpret and conclude.
Australia Post claims that the mean daily number of customers at a particular branch is 35...
Australia Post claims that the mean daily number of customers at a particular branch is 35 with standard deviation 8. This mean is too low and they wish to close this branch. An investigation measured the number of daily customers over a 30-day period and found a mean of 38. Use a hypothesis test on the mean to determine if this investigation supports the claim of Australia Post (at the 5% level).
A bank claims that the mean waiting time in line is less than 4.1 minutes. A...
A bank claims that the mean waiting time in line is less than 4.1 minutes. A random sample of 60 customers has a mean of 4 minutes. Assuming a population standard deviation of 0.6 minute, test the bank's claim with an ? = 0.05 level of confidence. ?0 = ___________________________________ ?? = ___________________________________ Test Statistic = __________________________ Alpha level of significance= __________________ Classical Critical Value = ____________________ P-value = _______________________________ ________Conclusion: A) reject ?0 B) fail to reject ?0 ________Interpretation:...
The manager of a grocery store has taken a random sample of 100 customers. The average...
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known at 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly different than 3 minutes. Use α = 0.05. 14. The test statistic is a. 1.96 b. 1.64 c. 2.00 d. 0.056...
The Gilmore daycare claims that they use more than 110 diapers daily. The manager takes a...
The Gilmore daycare claims that they use more than 110 diapers daily. The manager takes a random sample of used diapers use 61 days (2 months) and finds that the sample mean is 108 diapers with a standard deviation of 17. a) Test at α = 0.06 b) Construct a 90% confidence interval
A company claims that their lightbulbs last an average of 400 days. To test this claim,...
A company claims that their lightbulbs last an average of 400 days. To test this claim, a random sample of 25 lightbulbs is tested and it is observed that they last for an average of 380 days with a standard deviation of 60 days. Part A) Assuming that the population of the time to failure of all lightbulbs is normally distributed, test the null hypothesis that the average life-length of their lightbulb is 400 days against the alternative that it...
Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less than 5 days. A sample of 30 past customers is taken. The average delivery time in the sample was 15 days with a sample standard deviation 5 days a. b. c. d Construct a 95% confidence interval for the population variance Construct a 90% confidence interval for the population standard deviation. State the null and alternative hypotheses to be tested. Test the company's claim...
A local hardware store claims that the mean waiting time in line is less than 3.5 minutes. A random sample of 20 customers has a mean of 3.3 minutes with a standard deviation of 0.8 minute. If a = 0.05, test the store's claim. Assumption: ? Parameter: ? Hypothesis: ? Test Statistic: ? Reject- Region: ? Calculated Test Statistic: ? Conclusion: ? P-value: ?
QUESTION 27 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 55 minutes and the sample standard deviation was 2 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 5 minutes The hypothesis to test the manager's concern is: Hops 5, Ha>5 The test statistic is a...
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