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1. Choose an American household at random and ask how many cars and trucks that household owns. Here are the probabilities as of 1997:
Number of Vehicles
0
1
2
3
4
5
Probability
0.04
0.25
0.45
0.18
0.06
0.02
What is the probability that a randomly chosen household owns more than one motor vehicle?
A) 0.96
B) 0.71
C) 0.26
D) 0.25
2. A certain random experiment can result in one of four different possible outcomes, which we'll call A, B, C and D. It has been determined that the probabilities of these outcomes are as follows:
A
B
C
D
1/6
?
2/6
What is the probability of outcome C?
A) 0.75
B) 0.50
C) 0.25
D) 0
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
Assume that the number of left-handers is a binomial random variable. (Refer to the formula for mean and standard deviation for binomial prob. Distribution)
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
I have computed an analysis of variance for three groups with 10 observations per group. Evaluate the degrees of freedom for the F test
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
The Wilcoxon signed rank test is computed for the data and gives a value W + = 161.5. Using the Normal approximation (without the continuity correction) the P-value.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
The researcher computes the sum of squares for groups as SSG = 40030 and the sum of squares for error as SSE = 414780. The numerical value of the ANOVA F statistic is
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
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