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Choose a t-test for each situation: one-sample t-test, two sample t-test, paired t-test, and no t-test.
a. A random sample of students of a college is asked their statistics score. Our goal is to determine whether the mean score for students of that college is significantly different from the population mean score for all the students at the university.
b. A researcher goes to a department store and observes whether each person coming in is male or female and whether they finish their shopping within 15 minutes (yes or no).
c. A researcher visits a hospital at night and records the number of cases handled by the doctors on duty and the gender of the doctors.
What additional information is obtained from measurements on an ordinal scale compared to measurements on a nominal scale?
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
in january 2007 consumer reports published their study of bacterial contamination of chicken sold in the u.s. they
the percentage of squirrels that test positive for rabies is 6.a what is the probability that for the next 10 squirrels
If the line is busy or if there is no answer, she uses the next number on her list as a replacement. Comment on both the randomness and the representativeness of the sample of persons who end up being interviewed.
The Kellogg School of Management at Northwestern University has no minimum GMAT score to be accepted into the MBA program.
Evaluate the union's claim. Include the hypotheses (both null and alternate), alpha, test statistic (highlight where it is calculated on your spreadsheet), decision, conclusion.
Write the probability density function of this random variable.- What is the probability that the task will be performed in less than 8 minutes? Explain.
sports fans tune to a local sports talk radio station according to a poisson process with the rate of three fans every
HDL cholesterol levels for men have a mean of 46 milligrams per deciliter of blood (mg/dl) with a standard deviation of 13.6 mg/dl.
Let X1 , X2 , • • • , Xn and Yi, Y2 , • • • , Ym be independent random samples from the two normal distributions N( O, 81 ) and N(O, 82).
What does it mean for two random variables to be uncorrelated?
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