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Question: Two thousand students took an exam. The scores on the exam have an approximate normal distribution with a mean μ = 81 points and standard deviation σ = 15 points.
a. Calculate the first- and third-quartile scores for this exam.
b. The middle 50% of the exam scores are between what two values?
(Define the parameter of interest, state the null and alternative hypotheses, compute the value of the test statistic and the p-value, state your decision and give the conclusion in the context of the study)
Suppose each client has a 1% chance of achieving perfect attendance during any given year independent of any other client. Determine the maximum value of q such that there is a less than 1% chance that the $1,000 fund will be inadequate to cover a..
1. a researcher sends a questionnaire to 6000 individuals. she gets back 5000 responses. the percentage of women among
This is also the probability distribution for the number of children under 18 in a randomly chosen family.
If there is relationship between parental income and SAT score, why can't we bring to a close that differences in score are caused by differences in parental income.
an experimenter wants to conduct a hypothesis test on a claim that there was no difference between two population
suppose that the u.s. government decides to charge beer consumers a tax. before the tax 25000 cases of beer were sold
how is the rejection region defined and how is that related to the zscore and p
Which type of error would the factory owner consider more serious?- Which type of error might customers consider more serious?
How does multiple correlation increase accuracy of prediction? - What is the purpose of partial correlation?- When a path diagram is shown, what information is conveyed by the arrows leading from one variable to another?
from a box containing 4 dimes and 2 nickels 3 coins are selected at random without replacement. find the probability
A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed.
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