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Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?
when a survey calls residential telephone numbers at random only 25 of the calls reach a live person. you watch the
is the average number of television watched per evening in australia less than in britain? null and alternative
Show that if a 2D Gaussian random vector Y- = (Y1, Y2) has uncorrelated components Y1, Y2, then those components are statistically independent random quantities.
If you want to be 95% confident of estimating the population proportion to within a sample error of +and - .05 and there is historical evidence that the population is approximately .35, what sample size is needed.
Identify the independent and dependent variables. Indicate the number of levels in the independent variable and describe each level.
How do you write a statistical analysis in which the emphasis is to compare the difference between the body mass index (BMI) values of men and women.
an issue that faces individuals investing for retirement is allocating assets among different investment choices.
A standard deviation of 350 hours. the manufacturer is considering a warranty. what proportions of the screens have a life between 1500 and 2500 hours?
a journal article reports that a sample of size 5 was used as a basis for calculating a 95 ci for the true average
For a series of random samples of 60, are the mean values of these random samples normally distributed? Explain. Calculate the standard error of the mean and explain the meaning of this value
Problem 1: What is the probability of drawing a heart, given that you drew a queen? Problem 2: What is the probability of rolling an even that you roll a two?
What are the 3 measures of dispersion/variation in a dataset? How do you calculate each of these 3 measures?
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