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Market researcher Gartner Dataquest reports that Dell Computer controls 27% of the PC market in the United States. Suppose a business researcher randomly selects 130 recent purchasers of PC.
a. What is the probability that more than 39 PC purchasers bought a Dell computer?
b. What is the probability that between 28 and 38 PC purchasers (inclusive) bought a Dell computer
c. What is the probability that fewer than 23 PC purchasers bought a Dell computer?
d. What is the probability that exactly 33 PC purchasers bought a Dell computer?
averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
the following factors were studied to see their effect on light intensity yabcdefgnbspmolaritysolute typephgas
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
Using these data, construct a 99% confidence interval to estimate the average number of days and excavator is rented to a client, and assume the number of days per rental is normally distributed in the population.
Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles. What is the probability of having a tire that lasts more than 80,000 miles.
Compare the vital capacityfor the two groups.calculate a 99% confidence interval for the difference.the result of this comparison may be misleading.why?
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
an automobile manufacturer is concerned about a fault in the braking mechanism of a particular model. the fault can on
Overall, the students' class attendance days (per year academic) is normally distributed around 180 days with a standard deviation of 15 days. What's the probability that the mean number of attendance days will be between 190 and 200?
A research company stated that 20% of missed school days are due to asthma. If a group of 400 school children are selected at random, what is the probability that fewer than 70 will miss school because of asthma?
flaws in a certain type of drapery material appear on the average of three in 250 square feet. if we assume the poisson
A standard deviation of about $9000. Approximately what percentage of household incomes in this state is between $27,000 to $63,000/year? Show all work as to how this is obtained.
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