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1. A researcher wishes to compare the effect of the rate of stepping on heart rate in a step-aerobics workout. A collection of 30 adult volunteers was randomly divided into three groups of 10 subjects each. Each group did a standard step-aerobics workout with group 1 at a low rate of stepping, group 2 at a medium rate of stepping, and group 3 at a high rate of stepping. The mean heart rate at the end of the workout for all subjects was determined in beats per minute. Assume the data for the three groups are independent and the data are approximately Normal. An ANOVA was run on this data with the partial ANOVA table given below.
The sum of squares (SSG) for groups is
A. 5591.688.B. 3727.792.C. 1863.896.
2. A researcher is studying treatments for agorophobia with panic disorder. The treatments are to be the drug Imipramine at the doses 1.5 mg per kg of body weight and 2.5 mg per kg of body weight. There will also be a control group given a placebo. Thirty patients were randomly divided into three groups of 10 each. One group was assigned to the control, and the other two groups were assigned to each of the two treatments. After 24 weeks of treatment, each of the subject's symptoms were evaluated through a battery of psychological tests, where high scores indicate a lessening of symptoms. Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
A. there is strong evidence that the mean test score is higher for both treatment groups than the control.B. there is strong evidence that the mean test score is higher for at least one of the two treatment groups than the control.C. there is strong evidence that the mean test score is not the same for all three groups.
Determine the probability that a single light bulb lasts over 120 hours. (d) Could you use the CLT to approximate the distribution of the total lifetime of these bulbs?
A local tire dealer wants to predict the number of tires sold each month. He believes that the number of tires sold is a linear function of the amount of money invested in advertising.
There are 4 entrances to a building in Philadelphia. The bldg maintenance super would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building.
The following table gives the median incomes of families by level of income and geographical region.
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.
A real estate company wants to study the relationship between house sales prices and some important predictors of sales prices. Based on data from recently sold homes in the area, the variables
Identify a decision process within your work or business interests that could be resolved based on data.
A representative of the Environmental Protection Agency (EPA) wants to select samples from 10 landfills. The director has 15 landfills from which she can collect samples. How many different samples are possible?
Classify as independent or dependent samples: The average price of gasoline at ten local stations, and the average price of gasoline at ten stations in another state.
Contains two black, six brown, and two blue socks, all randomly arranged. What is the probability that the two he draws are a matching pair?
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
If we know that the length of time it takes a college student to find out a parking spot in library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute
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