20. A business consultant wanted to investigate if providing day care facility on premises by companiesreduces the absentee rate of working mothers with 6-year old children. She took a sample of 45such mothers from companies that provide day care facilities on premises. These mothers missed anaverage of 6.4 days from work last year with a standard deviation of 1.20 days. Another sample of50 such mothers taken from companies that do not provide day care facilities on premises showedthat these mothers missed an average of 9.3 days last year with a standard deviation of 1.85 days.Construct a 98% confidence interval for the difference between the two population means.

Answered: 20. A business consultant wanted to…

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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2. A fast-food franchiser is considering building a restaurant at a certain location. According to a financial analysis, a site is acceptable only if the number of pedestrians passing the location averages more than 100 per hour. A random sample of 50 hours produced a mean of 110 and a standard deviation of 12 pedestrians per hour. Do these data provide sufficient evidence to establish that the site is acceptable? Use a=0.05.
6.The proprietor of a greenhouse claims that its pots of lilies average 6.0 buds, with a standard deviation of 0.4 buds. If a random sample of 12 pots of lilies from a large number of pots of lilies has a mean of 5.8 buds, does this deny the proprietor's claim of the mean number of buds at the 0.05 level of significance?
2. A professional racing team is holding tryouts at its test track. The team requires its drivers to have an average lap time of at most 133 seconds at its test track. The team will use a one sample z-test of significance to determine if they should hire a new driver. An amateur driver completes 10 timed laps of the test track with an average lap time of 140 seconds. If the standard deviation of all lap times at this track is 4.5 seconds, what is the value of the test statistic? Round your answer to two decimal places. Answer value Please show work!!!
5. please asnwer
34. A study was conducted to determine whether an expectant mother’s cigarette smoking has an effect on the bone mineral content of her otherwise healthy child. Particularly it was thought that smoking might lower the bone mineral content. To test this group 1 consisted of a sample of 77 newborns whose mothers smoked during pregnancy, their mean bone mineral content = 0.098 and the standard deviation = 0.026. Group 2 consisted of a sample of 161 infants whose mothers did not smoke during pregnancy, their mean = 0.095 and the standard deviation = 0.025. %3D %3D a) b) Are the two samples of data paired or independent? State the null and alternative hypothesis. (Do not do the test) buent Todousic a
Suppose a study is being planned that will investigate whether female Beagles with severe periodontitis (gum and mouth disease) give birth to smaller litters of puppies, on average, than Beagles without periodontitis. Based on previous research, the standard deviation of litter size is estimated to be 2.1 puppies.Suppose we suspect that Beagles with periodontitis will give birth to on average 6 puppies whereas Beagles without periodontitis will give birth to on average 5 puppies.
Kendra, the Human Resources manager for Moore Manufacturing wants to determine whether the employee retention rate is higher for the company's Eastern Division than it is for the Western Division. A random sample of 25 employees from Moore Manufacturing's Eastern Division (group 1) has an average time with the company of 4.8 years and a standard deviation of 1.1 years. A random sample of 23 employees from Moore Manufacturing's Western Division (group 2) has an average time with the company of 4.1 years and a standard deviation of 0.9 years. Conduct a hypothesis test at 0.02 significance. Round answers to 4 decimal places where appropriate. The Null and Alternative Hypothesis are: Ho: mew1 = mew2 and H1: mew1 > mew2. The appropriate distribution is Student's t. What is the test statistic? What is the p-value? State the appropriate conclusion based on the information.
An online stock trading company makes part of their revenue from clients when the clients trade stocks therefore, it is important to the company to have an good idea of how many trades its clients are making in a given year. In a sample of 98 clients of an online stock trading company, the average number of trades per year was 85 with a standard deviation of 17. If you were to test the hypothesis that the average number of trades per year is greater than the previous year when the average number of trades was 84 (using the 10% level of significance), what is the critical value? (please round your answer to 2 decimal places)
An online stock trading company makes part of their revenue from clients when the clients trade stocks therefore, it is important to the company to have an good idea of how many trades its clients are making in a given year. In a sample of 120 clients of an online stock trading company, the average number of trades per year was 82 with a standard deviation of 16. If you were to test the hypothesis that the average number of trades per year is different than the previous year when the average number of trades was 85 (using the 10% level of significance), the test statistic is -2.05 and the critical value is ± 1.65 . What is your conclusion concerning the null hypothesis? Reject the null hypothesis Fail to reject the null hypothesis
3. A local hospital doctor's team reports that the average cost of treatment of heart disease is 800 RO. To see if the average cost of treatment is different at a particular hospital, a researcher selected a random sample of 40 patients and found that the average cost of treatment is 400 RO. The standard deviation of the population is 350 RO. At test the claim of the hospital doctors.

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