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The Complaints Department of a popular used car dealer receives most complaints about the electrical system, particularly the starter. The department sent questionnaires to 300 owners of two-year-old, used, full-sized vehicles. The survey showed 15% of the owners had trouble with the starter. Based on the result of the survey, what is the probability that, in a sample of 12 owners,
A) exactly two owners will have starter problems.
B) at least one owner will have starter problems.
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. Find the following:
Mary claims that the range, standard deviation and variance are all measures of dispersion. John adds to Mary's claim by stating that the coefficient of variation is a measure of relative dispersion.
Determine for each variable if it is the explanatory variable, the response variable, or whether it could be both.
Do these results suggest that the different therapies have different effects on mental health? (Use the .05 level.) a. Use the five steps of hypothesis testing.
Each salesperson at stiles compton is rated either below average, average, or above average with respect to sales ability. Each salesperson is also rated with respect to his or her potential for advancement.
A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19, with standard deviation 2.
Each of four tasters picks one coffee anyway (not knowing which is which, because the coffee is in identical cups). What is the probability that a) All four tasters choose Tasty Bean?
The current advertising campaign for a major automobile brand would be changed if fewer than 70 percent of the consumers like it.
A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
Use the normal approximation to the binomial distribution and part (b) to answer the following question: What is the probability that a seat will be available for every person who shows up holding a reservation?
Construct a relative frequency distribution for the weights of regular Coke by starting the first class at 0.7900 lb. and use a class width of 0.0050 lb.
Consider the following estimated regression equation, based on 10 observations.
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