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A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 700 hours. A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim? Use a = 0.03.
Locate value of the population mean in your sketch and make an estimate of the standard deviation
Consumer Reports magazine tested paints. The table below shows the overall quality score and cost in dolllars per gallon. Test for a correlation. Based on these results, do you get better quality paint by paying more?
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
Assume that 12 percent of adults in this country have filed for bankruptcy at some point in their life.
A side effect of a certain anesthetic used in surgery is the hiccups, which occurs in about 10 percent of the cases. If three patients are scheduled for surgery today and are to be administered this anesthetic, compute the probability that
Test a hypothesis to see if this proportion has changed since 1985. I have the standard error and a t-score of 1.660. I need the test effect, test statistic and p-values.
The perimeter of a rectangular painting is 344cm; if the width of the painting is 73 cm, what is the length?
According to recent surverys, 53% of households have personal computers. if a random sample of 175 households is selected, what is the probability that more then 75 but fewer than 110 have a personal computer?
I have computed an analysis of variance for three groups with 10 observations per group. Evaluate the degrees of freedom for the F test
The total blood cholesterol concentrations, in mg/dL, are shown below for a random sample of six people. In the table below, x is the age of the subject and y is the subject's total cholesterol concentration. Find the 95% prediction interval when ..
The gas price index for 1985 was 218.5 and the gas price index for 2000 was 276.8. If it cost $18.13 to fill your gas tank in 1985, how much would it have cost to fill the same tank in 2000?
If there are 500 students in the school, what is the probability that everyone will pass the exam
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