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A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:
0
260
356
403
536
268
369
428
396
469
162
338
130
Construct a 95 percent confidence interval for the true mean.
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
Suppose that the results of the sample lead to rejection of the null hypothesis. Classify that conclusion as a:
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
The random variable X has which of the following probability distributions and What is the probability that no student wins
Carry out F test for significance of straight line regression of Y on X and interpret your results.
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
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