Ask Question, Ask an Expert

+61-413 786 465

info@mywordsolution.com

Ask Statistics and Probability Expert

1. Five-City Project. The Stanford Five-City Project is a comprehensive community health education study of five moderately sized Northern California towns. Multiple-risk factor intervention strategies were randomly applied to two of the communities. The other three cities served as controls. Outline the design of this study in schematic form.

2. Campus survey. A researcher conducts a survey to learn about the sexual behavior of college students on a particular campus. A list of the undergraduates at the university is used to select participants. The investigator sends out 500 surveys but only 136 are returned.

a. Consider how the low response rate could bias the results of this study.

b. Speculate on potential limitations in the quality of information the researcher will receive on questionnaires that are returned.

3. Employee counseling. An employer offers its employees a program that will provide up to four free psychological counseling sessions per calendar year. To evaluate satisfaction with this service, the counseling office mails questionnaires to every 10th employee who used the benefit in the prior year. There were 1000 employees who used the benefit. Therefore, 100 surveys were sent out. However, only 25 of the potential respondents completed and returned their questionnaire.

a. Describe the population for the study.

b. Describe the sample.

c. What concern is raised by the fact that only 25 of the 100 questionnaires were completed and returned?

d. Suppose all 100 questionnaires were completed and returned. Would this then represent an SRS? What type of sample would it be?

4. Body weight expressed as a percentage of ideal. Body weights of 18 diabetics expressed as a percentage of ideal (defined as body weight ÷ ideal body weight × 100) are shown here. Construct a stem-and-leaf plot of these data and interpret your findings.

107        119        99          114        120        104        88          114        124        116        

101        121        152        100        125        114        95          117

5. Air samples. An environmental study looked at suspended particulate matter in air samples (µg/m3) at two different sites. Data are listed here. Construct side-by-side stemplots to compare the two sites.

Site 1:  68           22          36          32          42          24          28          38

Site 2:  36           38          39          40          36          34          33          32

6. What would you report? A small data set (n = 9) has the following values {3.5, 8.1, 7.4, 4.0, 0.7, 4.9, 8.4, 7.0, 5.5}. Plot the data as a stemplot and then report an appropriate measure of central location and spread for the data.

7. Melanoma treatment. A study by Morgan and coworkers used genetically modified white blood cells to treat patients with melanoma who had not responded to standard treatments. In patients in whom the cells were cultured ex vivo for an extended period of time (cohort 1), the cell doubling times were {8.7, 11.9, 10.0} days. In a second group of patients in whom the cells were cultured for a shorter period of time (cohort 2), the cell doubling times were {1.4, 1.0, 1.3, 1.0, 1.3, 2.0, 0.6, 0.8, 0.7, 0.9, 1.9} days. In a third group of patients (cohort 3), actively dividing cells were generated by performing a second rapid expansion via active cell transfer. Cell doubling times for cohort 3 were {0.9, 3.3, 1.2, 1.1} days. Data are available in Excel and SPSS formats on the companion website as file MORGAN2006.*. Here is where you would log in to the companion website: http://publichealth.jbpub.com/Gerstman2e/Login.aspx?ref=/Gerstman2e/default.aspx

a. Create side-by-side boxplots of these data.

b. In addition, calculate the mean and standard deviations within each group. Comment on your findings.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M92829948
  • Price:- $35

Priced at Now at $35, Verified Solution

Have any Question?


Related Questions in Statistics and Probability

How do you find the forward discountpremium on the foreign

How do you find the Forward Discount/Premium on the foreign currency for 7.4 & 7.5?

Explain the similarities and differences between bagging

Explain the similarities and differences between "bagging" and "boosting" in predictive analytics.

In a recent year 8415394 male students and 4879215 female

In a recent year, 8,415,394 male students and 4,879,215 female students were enrolled as undergraduates. Receiving aid were 62.9% of the male students and 68.3% of female students. Of those receiving aid, 41.9% of the ma ...

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. Assume that the first cash flow will occur one year from today (that is, at t = 1). (Round your answer ...

The risk-free rate of return is 52 percent and the market

The risk-free rate of return is 5.2 percent and the market risk premium is 8.4 percent. What is the expected rate of return on a stock with a beta of 1.34?

The acme insurance company has two types of customers

The ACME Insurance Company has two types of customers, careful and reckless. A careful customer has an accident during the year with probability 0.01. A reckless customer has an accident during the year with probability ...

Last year a technology company bought one million in shares

Last year a technology company bought one million in shares of a GM stock at €40 per share and sold it one year later at €50. The spot exchange rate one year ago was $1.40 = €1 and the spot rate prevailing at the end of ...

The mean height of women in a country ages 20-29

The mean height of women in a country? (ages 20-?29) is 63.5 inches. A random sample of 65 women in this age group is selected. What is the probability that the mean height for the sample is greater than 64 ?inches? Assu ...

How does a market-maker decide the edge offset required to

How does a market-maker decide the edge (offset) required to perform an options trade? Explain why this edge would be different for options of different strikes as well as for option combinations?

Write out the sample space for the possible genders of the

Write out the sample space for the possible genders of the children. (For example, BBG would be one possible outcome in the sample space.) Use the sample space to find the probability that the family has at least one gir ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As