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The soap and detergent association issued its fifth annual clean hands report card survey for 2009. In a series of hygiene-related questions to American adults, it was found that 62% of 442 women washed their hands more than 10 times per day, while 37% of 446 men did the same. Find the 95% Confidence interval for the difference in proportions of women and men that wash their hands more than 10 times a day.
At the 1% significance level, can it be concluded that the current distribution of responses differs from that of a year ago ?? Formulate and test the appropriate hypotheses. Use the critical value approach.
compute the expected value and variance of U.Determine Expected value and variance using uniform distribution.
The average income of 11 families who reside in a rural area of the Midwest is $60,213, with a standard deviation of $2009. At α =0.05, can it be concluded that the families who live in the cities have a higher income than those who live in the ru..
Use 0.01 significance level to test the claim that the selection process is biased against Mexican-Americans. What is the mean and standard deviation for the numbers of Mexican Americans?
Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
Assume you have drawn a simple random sample of 10 students from a college campus and recorded how many hours each student studies (X) during the ¯rst week of December, 2009. Results:
Does it appear that the treatment is effective? That is, is it very likely that we would observe only 6/200 contract hepatitis when 7% of the population is known to do so?
What is the probability of making a Type II error if the population mean is 24,000 miles?
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form.
When 319 college students are arbitarily selected and surveyed, it is observed that 120 own a car. Determine a 99% confidence interval for true proportion of all college students who own a car.
What is the probability that of today's 1,000 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round your answer to 4 decimal places.)
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