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Weights of women in one age group are normally distributed with a standard deviation of 21 pounds. a researcher wishes to estimate the mean weight of all women in this age group. Find how large a sample must be drawn in order to be 90 percent confident that the sample mean will not differ from the population mean by more than 3.7 pounds.
The kinds of statistical methods that were used to formulate the author's argument.
If the company's report is correct, what is the probability that the average balance of an account in the sample is $383 or less?
Suppose standard deviation stays same, how much do you have to decrease your average production time so that 95% of time you can deliver product in under 75 hours?
A United Nations report shows the mean family income for Mexican migrants to the U.S.. is $27,000 per year. A FLOC evaluation of a sample 25 Mexican families units reveals a mean to be $30,000 with a sample standard deviation of $10,000.
Do women and men have different opinions about affirmative action? Based on a sub sample of 2008 GSS, the output figure below shows respondent's sex (sex) and attitudes toward affirmative action (DISCAFF: Are whites hurt by affirmative action).
Conduct a hypothesis test for each sample at the 0.01 level of significance and determine what action, if any should be taken.
The natural number 28A9B consists of different numbers and A is not equal to 0. When the number is divided by 9 the remainder is 7 and when it is divided by 5
Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test whether the averages are different at the 0.05 level of significance.
A new soft drink is being market tested. A sample of 400 individuals participated in the taste test and 80 indicated they like the taste. At a 5% significance level, test to determine if at least 22% of the population will like the new soft drink.
What is the critical F value for a sample of four observations in the numerator and seven in the denominator? Use a one-tailed test and the .01 significance level.
2 prizes of $1250, and 1 prize of 3000. Assume that 22,000 lottery tickets are issues and sold for $1. What is the lottery's expected profit per ticket?
A teller can process an average of 100 customers per hour, which also can be modeled by a Poisson distribution. If there is one teller on duty, determine:
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