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In a study of 420,006 cell phone users, 164 subjects developed brain cancer. Test the claim that cell phone users delevlop brain cancer at a rate that is different from the rate of 0.0340% for people who do not use cell phones. Because this issue has such great importance, use a 0.005 significance level. Use this information to anwser the following questions.
Hypothesis test?
What is the test statistic?
What is the P value?
What is the conculsion?
an engine oil supposed to have a mean viscosity of micro 85.0. a sample of n25 viscosity measurements resulted in a
Can researcher conclude that humidity has significant effect on eating behavior? Use a two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
A shipment of 250 netbooks contains 3 defective units. Determine how many ways a vending maching company can buy three of these units and receive a) no defective units b) all defective units c) at least one good unit.
The economists in the Obama administration suggested that the stimulus package that they recommended in early 2008 would keep unemployment under eight percent.
If the manager decides to spend $3000 on advertising, based on the simple linear regression results given above, what would the estimated sales be?
Four research participants take a test of mannual dexterity (high scores mean better dexterity) and anxiety test (high scores mean more anxiety). Scores are as follows:
a lock on a bank vault consists of three dials each with 30 positions. in order for the vault to open each of the three
To increase membership. Determine the probability of all three selected are CPAs? Illustrate the proper way to compute probabilty?
Let independent variable x represent years since 1950. Determine quadratic regression model for per capita cigarette consumption.
in a random sample of 60 refrigerators the mean repair cost was 150.00 and the standard deviation was 15.50. construct
1.a researcher wished to compare the average amount of time spent in extracurricular activities by high school students
question global tv news in a segment on the price of gasoline reported that the mean price nationwide is 1.29 per
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