![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 companys claim at the 10% level of significance. Test the companys claim at the 0.5% level of significance Comment on the answers on the two tests at 10% and at 0.5%. [51 [51 121 151 151 13] e. f.](http://img.homeworklib.com/questions/d56f73f0-6b36-11eb-84c5-1b78beb7b389.png?x-oss-process=image/resize,w_560)
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Question 2 1251 NICTUS furniture claims that the standard deviation in their delivery time is less...
In a advertisement, a pizza shop claims that its mean delivery time is less than 20...
In a advertisement, a pizza shop claims that its mean delivery time is less than 20 minutes. of A random selection 50 delivery times has a sample mean of 22 minutes and a standard deviation of 2.1 minutes. Is there enough evidence to support the claim at = 0.005. Find: Question 5 The null hypothesis ( H0) 22 min 22 min 20 min 20 min Question 6 The alternative hypothesis ( H0) 22 min 20 min 22 min 20 min...
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.
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:...
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...
(10 pts) In an advertisement, a pizza shop claims that its mean delivery time is less...
(10 pts) In an advertisement, a pizza shop claims that its mean delivery time is less than 30 minutes. A random sample of 36 delivery imes has a mean of 28.5 minutes and a standard deviation of 3.5 minutes. Is there enough evidence to support the claim at α-.05 ? (a) Set up the null and alternative hypotheses (b) Find the test statistic. (c) Find the rejection region and state your conclusion. (d) What is the P-value for this test?
Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes....
Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes. A random sample of 50 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Construct a 90% confidence interval for the population mean delivery time. What is the sample mean? 6 1.87 36 1.64 What is the sample size? 8.33 90 50 36 What is the population standard deviation? 0.85 50 36 6 What is the confidence level?...
1. A company produces surveying tapes of claims that the standard deviation of the length of...
1. A company produces surveying tapes of claims that the standard deviation of the length of their 100-ft tapes is 2.5 ft. UTA Civil Engineering department decides to test this claim by taking a sample of 35 tapes and checking their lengths. They found that the standard deviation of the sample is 2.8 cm. Does this undermine the company’s claim? Confidence level is 95%.
A local politician running for reelection claims the mean prison time for car thieves is less...
A local politician running for reelection claims the mean prison time for car thieves is less than the required 6 yrs. A sample of 80 convicted car thieves was randomly selected and the mean length of prison time was found to be 5.5 yrs. with a standard deviation of 1.25 yrs. alpha=0.05 State the claim mathematically. Is the claim the null or alternative hypothesis? State your hypotheses. Determine the test of significance (t-test or z-test) and justify your choice. State...
Exercise 3: (4 points) A product developer is interested in reducing the drying time of a...
Exercise 3: (4 points) A product developer is interested in reducing the drying time of a primer paint. Two formulations of the paint are tested. Ten specimens painted with the first formulation have a mean of 121 minutes and a standard deviation of 12 minutes while twelve specimens painted with the second formulation have a mean of 112 minutes and a standard deviation of 10 minutes. Assume that the two samples are independent simple random samples normally selected with same...
A local pizza place claims that they average a delivery time of 10.14 minutes. To test...
A local pizza place claims that they average a delivery time of 10.14 minutes. To test this claim, you order 13 pizzas over the next month at random times on random days of the week. You calculate that the average delivery time is 8.59 minutes with a standard deviation of 1.721 minutes. You create a 99% confidence interval of (7.13, 10.05). Of those listed below, what is the best conclusion you can make? Question 7 options: 1) The percentage of...
(10 pts) In an advertisement, a pizza shop claims that its mean delivery time is less than 30 minutes. A random sample of 36 delivery imes has a mean of 28.5 minutes and a standard deviation of 3.5 minutes. Is there enough evidence to support the claim at α-.05 ? (a) Set up the null and alternative hypotheses (b) Find the test statistic. (c) Find the rejection region and state your conclusion. (d) What is the P-value for this test?
Exercise 3: (4 points) A product developer is interested in reducing the drying time of a primer paint. Two formulations of the paint are tested. Ten specimens painted with the first formulation have a mean of 121 minutes and a standard deviation of 12 minutes while twelve specimens painted with the second formulation have a mean of 112 minutes and a standard deviation of 10 minutes. Assume that the two samples are independent simple random samples normally selected with same...
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