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A food processor wants to know whether the probability is really 0.60 that a customer will prefer a new kind of packaging to the old kind. If, in a random sample, 7 of 18 customers prefer the new kind of packaging to the old kind, test the null hypothesis θ = 0.60 against the alternative hypothesis θ 0.60 at the 0.05 level of significance.
A frequency polygon: does not depend on one variable. True-False
A person reads a research study of the effectiveness of perineal exercises in preventing urinary incontinence and notes that the number of subjects in each group is 120.
Construct a 98% confidence interval for the difference in the proportions of Americans who ate the recommended amounts of fibrous foods in 1983 and in 1992.
Do sit down restuarant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants?
A new product is tested on a random sample of 90. A total of 63 say they will buy the new product. A point estimate of the population proportion who will buy the product is 63/90 or .7 (70%). What is the standard error of the proportion?
It is estimated that 88% of senior citizens suffer from sleep disorders and 8% suffer from anxiety. Moreover, 6% of senior citizens suffer from both sleep disorders and anxiety.
A poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
suppose that two 4-sided dice are rolled that is each die has faces with numbers 1 2 3 amp 4. what is the probability
an electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with
The regulatory board of health in a particular state speci?es that the ?uoride levels in water must not exceed 1.5 parts per million (ppm). The 20 measurements given here represent the randomly selected daily early morning readings on ?uoride leve..
in the last quarter of 2007 a group of 64 mutual funds had a mean return of 4.8 with a standard deviation of 5.5. if
Calculate a 90% CI for the population proportion of Americans who believe there is intelligent life on other planets.
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