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Find the 98% confidence interval for the population mean µ if the sample mean is X = 84.2, sample standard deviation is s = 6.7, and sample size n = 40.
two cars leave towns 1000 kilometers apart at the same time and travel toward each other. one cars rate is 14
Perform a hypothesis test with significance level 5%. Show all work, and clearly state your conclusion.
A business man arrives on a randomly selected day in December. What is the probability that the temperature will be above?
Using a significance level of 0.05, perform a hypothesis test to see if the workers are right, and you need to hire more help. Write your hypotheses, calculate your test statistic and decide whether or not to reject your null.
problem 1.the drunken professor has a class of 34 students. he wants to divide them into seventeen pairs of partners
professor takes a random sample of students enrolled in statistics 101 at abc university. he finds the following there
Also, 72 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
From this small sample, the mean heart rate is 90 beats per minute with a standard deviation of 5. Find a 98% confidence interval for the true mean heart rate of all people with this untreated condition.
compare the standard deviation for the heights of males which 4.21 and the standard deviation for the heights of
to perform a certain type of blood analysis lab technicians must perform two procedures. the first procedure requires
A researcher reports a mean pulse rate of 80 for the ampled patients. the data also revealed a standard deviation of 10.5. what percent of patients pulse rates will fall between 69.5 ans 90.5?
The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month.
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