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If 10 customers call directory assistance for help with telephone number, what is the probability that NONE of them will be given the wrong number?
What is the 95% confidence interval for the mean number of minutes wasted per day?
Calculate the expected value and standard deviation of 8 - 3X. Calculate the expected value and standard deviation of 7X-2Y+15 when X and Y are independent.
Thirty randomly selected vehicles were stopped, and the tread depth of the right front tire was measured. The mean was 0.20 inch, and the standard deviation was 0.05 inch. Find the 95% confidence in
If you are to pick some pennies without looking at the dates, how many must your pick to be sure of getting at least five pennies from the same year?
In a recent study of 250 female freshmen showed that 70 did not want to work after marriage. Find the 95% confidence interval of the true proportion.
What is the probability that the male sample will have at most three more days of absences than the female sample?
A study was conducted to determine if the percent of women who receive financial aid was different than the percentage for men. At "alpha" = 0.10, is there significant evidence to reject the null hy
If the military deems a man with a pulse rate over 100 is medically unsuitable fro service, what proportion of adult males would be declared unfit because their pulse rate is too high?
If 20 voters are selected at random and asked their opinion, what is the probability that at least 15 of them are apposed to a new sales tax?
A bank manager wishes to see whether there is any preference in the times that customers use the bank. Six hours are selected, and the number of customers visiting the bank is as shown here. At "alp
A convenience store owner hypothesizes that the median number of snow cones he sells per day is 36. A random sample of 20 days yields the following data for the number of cones sold each day. At "a
For 11 repeated independent trials, with constant probability of success 0.4 for all trials, find the probability of exactly 8 successes.
At "alpha" = 0.05, test the claim that there is no difference among the means. In the event that the null hypothesis is rejected, do not perform a follow-up test (Tukey or Scheffe)
There is a class of 50 people answering a question. Let X be the number of students who get the correct answer. What is the expected value and variance of X?
Find the 99% confidence interval for the variance and standard deviation for the lifetime of batteries if a sample of 40 has a standard deviation of 3.4 months. Assume the variable is normally distr
What is the minimum sample size required in order to estimate the unemployment rate in Springfield to within 1% with 90% confidence?
There are 62 data values altogether. The degrees of freedom for the Between (dfB) and the degrees of freedom for the Within (dfW) are?
The company's lawyers insist that no more than 2% of the treated water be over the limit. To achieve this, to what mean should the company se the scrubbing machine.
Find the critical values of r given the number of pairs of data n and the significance level alpha n = 11, a = 0.01.
Use a =0.5 and test to determine whether the loan approval decision is independent of the loan officer reviewing the loan application.
An index of two store items for 2007 based on 2004 is to be constructed. The information for the prices and quantities for both years is given below. Use 2004 as the base period and 100 as the base
Explain the difference between a type I and type II error, and, why failing to reject a null hypothesis is NOT the same as accepting the null hypothesis.
Develop hypotheses so that rejection of the null hypothesis will allow us to concludethat the most recent bullish sentiment is weaker than that of one month ago.
The sample mean is 35 and the sample standard deviation 8. Develop a 95 percent confidence interval for the population mean.