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What's a difference between the z distribution and the t distribution?
They have different means
They have different variances
One is symmetric in the pdf curve while the other is not symmetric
None of the above
If 300 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. Compute and interpret the Z score for each of the six entertainment expenses.
q.1 an experiment was designed to compare several different types of air pollution monitors. the monitor was set up and
A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. A raw score of 47 is associated with what percentile?
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
in 2010 a gallup poll surveyed 1016 households in the u.s about their pets. of those surveyed 599 said they had at
Enter data into SPSS (use two columns: one for coding {0, 1, 2, 3, 4, 5} and one for DV)
a sample of 16 items provides a sample standard deviation of 9.5. test the following hypotheses using a .05.? 0 s 2
The waiting room for jury selection has 40 women and 30 men to choose from. A jury of 12 is selected from these 70 people, what is the probability that exactly 5 of the jury members will be women?
The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (d) Neither will fail? (c) One or the other will fail? Show all steps carefully.
question aggregate responses to three questions were obtained from a survey of 100 males and 100 females who were
A compute manufacturer is about to unveil a new,faster PC.The new PC is faster but intial tests incidcate there is more variation in the processing time.
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