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Mehrabuddin Safi

Mehrabuddin S.

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David Nguyen verified

Numerade educator

Carry all calculations and the answer to 4 decimal places unless otherwise noted. For example, the number "123.0000" has been carried and reported to 4 decimal places. (Yes, trailing zeros count.) Complaints about weekday airline flights not being on time average about 15.17 complaints per month at airports in small U. S. cities. The local airport is proud to advertise that its average monthly on-time performance is superior to the national monthly average for small city airports. Since June 2003, a random sample of nine months reveals that the number of complaints regarding weekday flights not being on time at the local airport were: 9 10 12 13 14 15 15 16 17 Note: "mu" refers to the population mean. The null hypothesis should read: The alternate hypothesis should read: What is the correct test statistic? Why? What is the sample mean? (Fill in the blank with the correct number to 4 decimal places.) What is the population mean, mu? (Fill in the blank with the correct number to 4 decimal places.) Will you use the population standard deviation or the sample standard deviation? What number will you use for the standard deviation? (Fill in the blank with the correct number to 4 decimal places.) What is the computed value of the test statistic? (Fill in the blank with the correct number to 4 decimal places.)

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David Nguyen verified

Numerade educator

The HR manager wonders if people are taking less vacation because they are working from home. Last year, staff averaged 7.3 hours of vacation per month. A random sample of 75 employees from the first six months of the year reveals an average of 6.8 hours of vacation per month with a sample standard deviation of 1.5 hours. What is the hypothesis and null hypothesis? What is the standard error and t score? Using the t distribution table, how likely is it that the number of vacation hours used is not less this year than last year? (0.10, 0.05, 0.025, 0.01, 0.005, 0.001, 0.0005) Do you reject or accept the null hypothesis?

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David Nguyen verified

Numerade educator

department manager finds that the average years of experience in the department is 5 years, with a standard deviation of 3.5 years. The board wants to know how many years most of the workers in the department have been on the job. You decide to give the board the range of years that represents 68% of the workers around the average. What is the lowest and highest years of experience of the middle 68%?

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David Nguyen verified

Numerade educator

The public admin clerical union wants to show that their member's salaries are the lowest in the region. The union must survey their 20,000 members. They union wants to be 95% sure that the estimate is within $200 of the real mean. How large should the sample size be? Assume an estimated mean of $35,000 and a $1,000 standard deviation.

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Ana Carolina Da Cruz verified

Numerade educator

Birthweight 4.55 4.32 4.1 4.07 3.94 3.93 3.77 3.65 3.63 3.42 3.35 3.27 3.23 3.2 3.15 3.11 3.03 2.92 2.9 2.65 3.64 3.14 2.78 2.51 2.37 2.05 1.92 4.57 3.59 3.32 3 3.32 2.74 3.87 3.86 3.55 3.53 3.41 3.18 3.19 2.66 2.75 smoker (no=0, yes=1) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Show your work for the calculations. State the result of testing the null hypothesis. State if the hypothesis is supported or not. In 1 to 3 paragraphs, explain the results of the test. Using the difference of means test the following: Hypothesis: The mean birth weight of babies born to mothers who do not smoke is higher than the mean birth weight of babies born to mothers who do smoke. Null hypothesis: The mean birth weight of babies born to mothers who do not smoke is not higher than the mean birth weight of babies born to mothers who smoke. (assume data in the data set is a sample)

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Emily Himsel verified

Numerade educator

Find an example of a research hypothesis in public administration. Discuss how this is used.

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Kaden Bunch verified

Numerade educator

Analyze why a public manager should understand survey research using a specific example.

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Rochan Bakthisaran verified

Numerade educator

Explain the usefulness of confidence interval estimates in public decision-making?

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Emily Himsel verified

Numerade educator

Birthweight 4.55 4.32 4.1 4.07 3.94 3.93 3.77 3.65 3.63 3.42 3.35 3.27 3.23 3.2 3.15 3.11 3.03 2.92 2.9 2.65 3.64 3.14 2.78 2.51 2.37 2.05 1.92 4.57 3.59 3.32 3 3.32 2.74 3.87 3.86 3.55 3.53 3.41 3.18 3.19 2.66 2.75 Gestation 44 40 41 44 42 38 40 42 38 38 41 40 38 41 40 37 39 34 39 33 40 41 37 39 37 35 33 41 40 40 38 39 39 45 39 41 40 39 38 41 35 40 Look at the data and determine two experiments you can do with this data. Write a hypothesis and null hypothesis statements for each of the two experiments. In 1 to 3 paragraphs for each experiment, describe in narrative form the hypothesis and why you think it will be true. The calculations are not required.

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Jeff Vermeire verified

Numerade educator

Determine the necessary sample size to be 95% certain, where the estimated standard deviation is 220, and the Error (E) is 30.

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