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A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained. Half of these children had no siblings and the others had at least one older sibling who is within 5 years of the child's age. The psychologist records a social skills score for each child and obtained the following data:
No Sibling.....................Older Sibling
...n=12...............................n=12
...M=17..............................M=24
...SS=580........................SS=608
Do these data indicate that having an older sibling has a significant effect on the development of social skills? Use a two tailed test at the 0.05 level.
Wheel-Rite has agreed to ship the maximum number of wheel bearings that it produces each day to Itex when an order has been received.
Obtain the simple linear regression equation, then analyze the residuals by (a) constructing a histogram
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
Make a point estimate and a 95% confidence interval estimate.
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Use Excel and the data to test whether the mean alcohol expenditures for UCM students is equal to that of SBU students using a 1 % level of significance.
How does one find expected profit from a probability demand distribution?
A doctor prescribed the drug penicillin to three different patients as a form oLtreatment for an infectious disease. It is known from the general population that 20 out of every 100 individuals are allergic to the drug.
Normal approximation to the Binomial distribution - Evaluate the probability that at least 195 of the students are female.
An office manager wishes to estimate the mean time required to handle customer complaints. A sample of 38 complaints shows a mean time of 28.7 minutes with a standard deviation of 12 minutes.
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