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How many students studied between 2.2 hours and 7 hours? What percentage of the students studied for more than 5.8 hours?
Select a company (maybe your employer) and assess how it uses data in marketing its products or services. (If it is not your employer, find a sizable local company or search the Internet for a compa
A study is conducted to compare three new appetite suppressants (A, B, and C) to a placebo in terms of their effects on weight reduction. A total of 80 participants are involved and are randomly ass
You want to estimate the standard deviation of the population of current Annual incomes of adults in the United States. Find the minimum sample size needed to be 99% confident that the sample stand
Find the sampling distribution and PDFs of Ysub1 and Ysubn for random samples of size n from a continous uniform population with alpha=0 and beta=1.
According to CNN/USA Today poll appox. 70% of Americans believe the IRS abuses its power. Let X equal the number of people who believe the IRS abuses its power in a sample of n=25 Americans. Assumin
An inspector chooses a sample of parts coming from an automated lathe by visually inspecting all parts, and then including 10 percent of the "good" parts in the sample with the use of a table of r
Find the probability distribution that in a random sample of size n=4 from continous uniform population with alpha=0 and beta=1, the smallest value will be atleast 0.20.
Find the sample size needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.03 margin of error, use confidence level 0f 98%, and use results from prior Pew research
In a tire factor, the quality control inspector examines a randomly chosen sample of 15 tires. When more than one defective tire is found, production is halted, the existing tires are recycled, and
What percent of the students use the library frequently? Suppose you see a student use the library everyday. What is the probability that this student is a freshman?
An automobile insurance firm wants to find the average amount per claim for auto body repairs. Its summary records combine amounts for body repair with all other amounts, so a sample of individual c
What is the probability of getting a sum of 6? (Enter your answer as a fraction.) What is the probability of getting a sum of 4? (Enter your answer as a fraction.
What is the minimum possible value of X? What is the maximum possible value of X?
Suppose a manufactuirng company make a certain item. The time to produce each item is normally distributed around a mean of 27 minutes with a SD of 2.5 minutes. Thus, the population of production ti
Makers of generic drugs must show that they do not differ significantly from the "reference" drugs they imitate. One aspect in which drugs might differ is their extent of absorption in the blood.
Make a histogram of the data (use class sizes of 1.5 or 2) to see that they appear to follow an approximately Normal distribution. Consider the question: Do milk-drinking mothers lose less bone min
Using the simple random sample of weights of women from a data set, we obtain these sample statistics: n=40 and /x=146.82 lb. Research from other sources suggests that the population of weights of w
A consumer group rated 12 manufactured products imported from a single source on a scale of 1 to 10. The data are shown below. Do the data provide sufficient evidence to indicate that the median sco
Assuming normality and equality of variances, would you conclude from these results that the mean weight of the product had increased significantly at the 5% level of significance during the second
If market research is performed for a new product, what is the probability that the results indicate a successful market for the product and the product is actually not successful?
What is the formula of t-quantile distribution needed to calculate an exact 90% confidence interval for the difference between the population means?
Compare and contrast the mean, the median, and the mode. Which statistic is not as beneficial for extreme scores, and which statistic can have more than one value?
The professor teaching a large introductory class gives a final exam that has alternate forms, A, B, and C. A student taking the exam using Form B is upset because she claims that Form B is much har
What is the mean time until a packet is formed, that is, until five messages arrived at the node? What is the standard deviation of the time until a packet is formed?