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The mean age at which a US consumer purchases their first car is 20.2 years. The standard deviation is 2.1 years. For a random sample of 50 first-time car buyers, what is the likelihood that the average age for this sample would be over 21 years of age?
a researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population
A student is selected at random and found to have a GPA of less than 2.5, what is the probability that the student is from a private school?
A questionnaire will be published and the first 1000 completed questionnaires will be analyzed. Which of the following errors will be associated with the sample? Sampling errors only.
The Motion Picture Associa- tion of America studies the ethnicity of moviegoers to understand changes in the demographics of moviegoers over time. Here are the numbers of moviegoers (in millions) classified as to whether they were Hispanic, Africa..
According to the British United Provident Association (BUPA), a major health care provider in the U.K., snoring can be an indication of sleep apnea which can cause chronic illness if left untreated. In the U.S.A., the National Sleep Foundation rep..
Hanging on the rack are 4 medium, 10 large, and 6 extra-large blouses. Find the probability of each event described. The fi rst two blouses she grabs are the wrong size.
assume that the helium porosity in percentage of coal samples taken from any particular seam is normally distributed
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
for the binomial sample sizes and null-hypothesized values of p in each part determine whether the sample size is large
in a certain town 40 of the people work for the federal government. the table shows the probability distribution for
Does having an advanced degree make any difference in the unemployment status of the alumni of this University? Support your answer adequately.
Suppose the population standard deviation is a=25. (The a is actually the funny looking 0 with the line that goes from the top right up at an angle) Compute the standard error of the mean
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