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The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and participating in a study of risk factors for obesity.
Marty Rowatti recently assumed the position of director of the YMCA of South Jersey. He would like some current data on how long current members of the YMCA
A sample of 81 observations is taken from a normal population with a standard deviation of 5. The sample mean is 40.
A toy manufacturer wants to see how long, on average, a new toy captures children's attention.
Average cost of $3,200 for products. n=25. After review it seems mean cost is $2,000 with a standard deviation of $150.
If two large independent samples are taken from two populations, the sampling distribution of the difference between the two sample means can be determined
Many newspapers, when reporting results of political polls, say that with 95% confidence, the results are in error by no more than ±3 percentage points
Compute the 99% confidence interval based on four data points that have a sample mean of 71.5 and a sample standard deviation of 16.6032
Explain how you know the data in any research you are doing is valid.
Explain the Central limit theorem in your own words. What is the value of it? What assumption does one have to make when using it?
In a nationwide survey of 1000 companies with more than 50 employees, managers were asked to rank various factors that influence their decisions in hiring
A marketing firm wants to estimate the average amount spent by patients at the hospital pharmacy. For a sample of 100 randomly selected patients
A drug manufacturer wants to estimate the mean heart rate for patients with a certain heart condition.
A consumer group would like to estimate the average amount of P G and E bill for the month of March for single family homes in the San Francisco Bay area
A random sample a 16 Google managers yield the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000
A sample of 35 golfers showed that their average score on a particular golf course was 80 with a standard deviation of 6.
Why are estimations and confidence intervals important?
You work for a consumer advocate agency and want to find the mean repair cost of a washing machine.
A recent study focused on the number of times men and women who live alone buy take-out dinner in a month. The information is summarized below.
Your hospital is negotiating with medical insurance providers, who would like to reduce the amount they pay as reimbursement for hospital stays.
Test the null hypothesis that the population mean weight loss is zero versus the alternative hypothesis that the mean weight loss is greater than zero
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Katherine Tao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package. Her staff reports that 17% of a random sample
On 10 leases on the outer continental shelf in the Gulf of Mexico in 1984, Atlantic Richfield submitted bids
The personnel director of a large corporation wished to study absenteeism among clerical workers at the corporation's central office during the year