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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)
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an:
In light of these data, are the percentages of divorcing couples with prenuptial agreements equal in these four places?
A standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.
The one time fling. Have you ever bought the article of clothing (dress, sports jacket, etc.) worn item once to a party, and then returned purchase?
John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
Determine the values on the 3-sided die so that the outcome probabilities for rolling the two dice described above match exactly the outcome probablities for rolling two standard (6-sided) dice.
Has there been a significant shift upward in the percentage of persons who want to go to Europe? Using the .05 significance level for this study.
Discuss how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
Determine the least squares estimators γ and δ for this second model associated to corresponding LS estimators α and β of first model?
What is a normal distribution? What is a Z-Value? Can you provide and example of how they relate?
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