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A university reports that the middle 50% of the SAT I math scores of its students were between 565 and 690, with half the scores above 605 and half below.
a. What SAT I math scores would be considered outliers for that university?
b. What can you say about the shape of this distribution?
The distribution is probably: approximately normal, skewed left, uniform or skewed right.
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
The probability that the residents?own 2 cars is 55%. Of the households surveyed, 60% had incomes over $50,000. The probability that the? residents of a household own 2 cars is?
Describe why the normal distribution can be used as an approximation to binomial distribution. What conditions should be met to use the normal distribution to approximate the binomial distribution? Why is a correction for continuity essential.
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
Suppose that in a hypothesis test with null hypothesis = 13.0 at 0.05, that a value of 11.0 for the sample mean results in the null hypothesis not being rejected.
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
An investigator wishes to study the effect of cigarette smoking on the development of myocardial infarction (MI) in women. A sample of 2000 disease-free current smoking women and 100 disease-free ex-smoking women
Assuming this is literally true, how can it be explained? What facts and/or statistics would you need to know to expose this misleading claim?
Let X be the number of kings selected and Y the number of jacks selected. Find the joint probability distribution function.
In a random sample of 26 people, the mean number of books they had read in the past year was 14.93 books and the standard deviation was 16.60 books.
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