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In a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35. The following results are obtained.
age18: average score 100 SD=15age 35: average score 100 SD 15 r=0.80
a) estimate the average score at age 35 for all the individuals who scored 115 at age 18.b) predict the score at age 35 for an individual who scored 115 at age 18.
The second segment goes from (1,1) to the point (x, 1). Sketch the distribution function, and determine what x has to be in order to be a legitimate density curve.
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
Determine the probably of selecting a female or an accounting major? Which rule of addition did you apply?
Calculate the mean, median, range, and standard deviation for the Body Fat Versus Weight data set. Report your findings, and interpret the meanings of each measurement.
The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes: 5 4 5 4 4 3 6 4 3 3 5 6 3 3 2 7 4 5 2 2 2 3 52
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region.
What sample size is need if the agency wants to be 90% confidence of being correct to within +/- 5 minutes? if 90% is desired, how many listeners need to be selected?
Suppose that the mean of the annual return for common stocks from 2000 to 2012 was 8.5%, and the standard deviation of the annual return was 25.2%.
A scientist wishes to find the 98% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
Both objective and subjective criteria should be used to determine whether a process is in control. Do you agree or disagree?
Shoveling Heart Rates Because cardiac deaths appear to increase after heavy snowfalls, an experiment was designed to compare cardiac demands of snow shoveling to those of using an electric snow thrower.
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