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A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
a. Is it a 1 or 2 tail tes?
b. Compute the statistical calculation.
c. What is your decision regarding H1?
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
Give critical test statistic and compute sample test statistic. Test null hypothesis at alpha level .01.
Assume 1.5% of antennas on new Nokia cell phones are imperfect. For random sample of 200 antennas, determine the probability that: None of the antennas is defective.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
The best estimator or appreciative of the population proportion is 0.45. How large must the sample be?
At the .05 significance level, can we conclude that the guideline is still reasonable?
There is a statistical deception here. Explain what is deceptive about the bar graph.
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
What IQ score should one have in order to be eligible for Mensa?
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
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