8. In Maidin supermarket, the customer's waiting time to check out is approximately normallydistributed with a standard deviation of 2.5 minutes. A sample of 25 customer waiting timesproduced a mean of 8.2 minutes. Is this evidence sufficient to reject the supermarket's claimthat its customer checkout time averages no more than 7 minutes? Complete this hypothesistest using the 0.02 level of significance.a) Solve using the p-value approach.b) Solve using the classical approach.9. Based on the previous record, the average IQ for students at Centre of Agricultural Science,UPM is 90 with a standard deviation is 15. A lecturer believes that this value has changed.He decided to conduct an IQ test and 30 students are chosen at random. After the analysisof the results, he found out that the average IQ for the sample is 85. Is there any evidenceto suggest that the average IQ has changed? Carry out the hypothesis test at level ofsignificance, a = 0.02 usinga) classical approach. Determine the critical value by sketching the normal curve.b) p-value approach

The z-test is used to compare the population mean with the specified value when population standard…

Answered: 8. In Maidin supermarket, the…

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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Suppose the mean height of women age 20 years or older in a certain country is 62.2 inches. One hundred randomly selected women in a certain city had a mean height of 61.7 inches. At the 1% significance level, do the data provide sufficient evidence to conclude that the mean height of women in the city differs from the national mean? Assume that the population standard deviation of the heights of women in the city is 3.9 inches. Set up the hypotheses for the one-mean z-test. H0: μ (≠, >, <, =) ________ppmHa: μ (≠, >, <, =) _________ppm Compute the value of the test statistic.z=__________(Round to two decimal places as needed.) Determine the critical value(s). Select the correct choice below and fill in the answer box within your choice. (Round to two decimal places as needed.) A. The critical value is zα=____________ B. The critical values are ±zα/2=±____________ C. The critical value is −zα=___________
A company claims that the average time a customer waits on hold is less than 5 minutes. A random sample of 35 customers shows a sample mean wait time of 4.78 minutes. Assume that the population standard deviation of wait time is 1.8 minutes. Test the company's claim at 1% level of significance. What is your conclusion.
You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes. Perform a hypothesis test to determine if there’s evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes by answering the following questions: (a) What are the null and alternate hypotheses for this test? (b) What is the value of the test statistic for this test? (c) Using the critical value approach, at the 0.05 level of significance, what is the decision rule? (d) What is your conclusion in context of the problem? (Answer this question in a complete sentence(s) and include why, referring to the decision rule.) (e) Using the p-value approach, at the…
Over a period of 10weeks, a veterinarian took blood glucose reading from a horse, finding a mean of 93.8 mg/100 ml. and a standards deviation of 12.5 mg/ml. The mean glucose level for a healthy horse is 85 mg/ml. a. Perform a test of hypothesis at a 80% confidence level. Use the p-value method and a two tailed test of hypothesis. b. Perform a test of hypothesis at a 90% confidence level. Use the critical value method and a right tailed test.
a. State the Null and Alternative Hypotheses b. Choose the appropriate statistical test c. Determine the Level of Significance and the Critical Value & Solve for the computed value
An electronics production sequence includes a process where a film of metal is deposited on a board. The film must be more than 1.000 mm thick. If the film is too thin the process fails. The engineer ran a test where the null hypothesis was that the mean thickness was at most 1.000 mm. A sample of 100 boards had a mean thickness of 1.007 mm and a standard deviation of 0.050 mm.At what level of significance would the null hypothesis be rejected? Express your answer at a decimal (not a percent) rounded to three places.
2. A pain reliever currently being used in a hospital is known to bring relief in a mean time of 3.5 minutes. To compare a new pain reliever with the one currently being used, a random sample of 45 patients is given the new drug. The mean time to relief for this sample is 2.8 minutes with a standard deviation of 1.14 minutes. a) Test the research (alternative) hypothesis that the new drug is more effective than the old drug, using α ≤ .05. b) Assuming a standard deviation of 1.14 minutes, approximately how large a sample of patients would be needed to form a 90% confidence interval to estimate the population time-to-relief of the new drug accurate to within plus or minus 10 seconds? Answers: 2. a) Z = -4.12, reject H0, new drug is more effective, b) 127
The average undergraduate cost for tuition, fees, and room and board for two-year institutions last year was $14,124. The following year, a random sample of 20 two-year institutions had a mean of $17,124 and a standard deviation of $3700. Is there sufficient evidence at the alpha level of 0.05 to conclude that the mean cost has increased. Show 6 steps of hypothesis
Do male and female servers at Swank Bar work the same number of hours? A sample of 65 female servers worked an average of 30 hours per week, with a standard deviation of 2. A sample of 65 male servers worked an average of 23 hours per week, with a standard deviation of 4. Let 41 and uz represent the typical number of hours worked by all female and male servers at Swank Bar, respectively. Estimate with a 90% confidence level how many more hours female servers work. Round answers to the nearest hundredth. Which of the following does your data suggest? O Male servers work more hours O Female servers work more hours O Female and male servers work about the same number of hours

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