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A random variable for Canadian provinces and territories. Suppose that you select a Canadian province or territory at random and record X, the population (in thousands).
(a) Is X a random variable? Explain your answer.
(b) Give the probability distribution of X.
(c) Explain how you would calculate the mean of X, then calculate it.
(d) Explain how you would calculate the variance and the standard deviation of X. You do not need to do the calculations, but describe the needed calculations in detail.
a regression line for a data set was found to be yt 1.25 - 3.84x . what is the point prediction of y for x 20?a.
Write probability statements relating hemline height, stock market prices, and "adven- turesomeness" that correspond to the following description of these relationships:
I. What is the population? II. What is the sample? III. Is the study observational or experimental? Justify your answer. IV. If observational, identify ALL variables. If experimental, identify ALL independent and dependent variables.
Three hypotheses-ecocide, rat outbreak, and climate change-are candidates as explanations of why the society of Easter Island collapsed. In a paragraph, describe the seven steps of the scientific method
The probabilities of these three events are estimated to be 0.4, 0.25, and 0.35, respectively.-Find the mean and standard deviation of the percentage change in salaries next year at Indiana University.
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenien..
A lending institution supplied the following data on loan approvals by four loan officers. Conduct an appropriate Hypothesis test to determine whether the loan approval decision is independent of the loan officer reviewing the loan application.
You have been asked to develop a study of the effects of watching Sesame Street on childrens' gender role orientations, intelligence, or sociability.
About what percent of the observations lie between 55 and 65?
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
State the decision rule using the .01 significance level. Compute the value of chi-square. What is your decision regarding Ho?
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