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A test was conducted to compare the wearing quality of the tires produced by two tire companies. A random sample of 16 cars is equipped with one tire
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages.
You have administered a standardized test of manual dexterity to two groups of 10 semi skilled workers.
The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 50 such batteries has a mean
In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 36 pieces of carry-on luggage was weighed.
A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet.
For the supermodel dataset at the right, treat height as the explanatory variable and weight as the response variable.
Suppose we wish to test the following hypotheses for the data:
A survey of a random sample of 250 car commuters indicates that 80 would switch to commuting by public transport if they had to pay at least $10 per week
The UNITE/MORI 2004 survey of student experiences estimated that university students in the UK paid on average $54 per week in accommodation costs.
Part of my job description is to teach Recruiters their daily individual tasks and how to properly manage their time.
In each of the following exercises, a set of condition is given. To construct a 95 percent confidence interval for the population mean
A machine produces 9 inch latex gloves. A sample of 85 gloves is selected, and it is found that 36 are shorter than they should be
Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation o.
What is the feasible range for r, the correlation coefficient?
If X=85 (sample mean), 8 is population standard deviation, and n=64 is sample size, construct a confidence interval estimate for the population mean.
The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol.
A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below.
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