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Suppose IQ scores were obtained from randomly selected couples. For 20 such pairs, of people the linear correlation coefficient is 0.799 and the equation of the regression line is ^y=-13.82+0.87x. Where x represents the IQ score of the husband. Also the 20x values have a mean of 100.46 and the 20 y values have a mean of 101.25. What is the best predicted IQ of the wife, given that the husband has an IQ of 103. Use a significance level of 0.05.
The best predicted IQ for the wife is _________(round to one decimal place as needed)
Based on an SRS of 50 pineapples with a mean weight of 31.6 ounces, did the new irrigation system cause an increase in the mean weights of pineapples produced? Explain your answer completely.
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
Three scholarships are available for students. Their values are: $2,000, $2,400, $3,000. Twelve students have applied and no student may receive more than one scholarship. Assume all twelve students are in needs of the funds, how many different..
What is the value of the population mean? What is the best estimate of the value?
What is the probability that the dample mean grade point average will be either less than 2.709 or more than 2.955.
A feed company is developing a feed supplement from two grains A and B. Each kilogram of A contains 0.3 grams of protein and 0.2 grams of carbohydrates; each kilogram of B contains 0.9 grams of protein and 0.1 grams of carbohydrates.
Suppose the population standard deviation is 0.3 minutes and the sample mean is 9.975. Find the sample mean and compute. A 90-percent confidence interval for the true mean delivery time, is?
In a bottling process, a manufacturer will lose money if the bottles contain either more or, less than is claimed on the label. The quality manager of a plant is interested in testing whether the mean ounces of catsup per family size bottle differ..
One of 4 bus drivers is also arbitarily chosen. Let Y denote number of students on his bus. Calculate expectations and variances of X and Y.
Test the claim that the proportion of students in this district who use computers in school is at least 80%. State the correct hypotheses.
About one-third of the students entering a certain university drop out during or at the end of their first year." Does this statement illustrate percentage, proportion or probability?
400 customers of the company and finds that 30 of them are actually not happy about the service. Set up the null and alternative hypotheses to test for the company's claim.
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