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A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of 0.834343 inches with a standard deviation of 0.001886 inches. a) Why would nickeldiameters vary?
b) Construct a 99 percent confidence interval for the true mean diameter of anickel.
c) Discuss any assumptions that are needed.
d) What sample size would ensure an error of± 0.0005 inches with 99 percent confidence? NBC asked a sample of VCR owners to record "Late Night with David Letterman" on their VCRs. Of the 125 VCR owners surveyed, 83 either "gave up or screwed up" because they did not understand how to program the VCR.
(a) Construct a 90 percent confidence interval for the true proportionof VCR owners who cannot program their VCRs.
(b) Would viewers of this program betypical of all television viewers? Explain.
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
A random sample of 1000 college students ages from 18-25 revealed that 234 voted for the American Idol. Similarly, 198 college students stated they voted in the 2006 midterm elections.
Let mutually independent random variables X1, X2 and X3 be N(0,1), N(2,4) and N(-1,1) respectively. Compute the probability that exactly two of these three variables are less than zero.
A retailer that sells home entertainment systems accumulated 10451 sales invoices during the previous year. The total of the sales amount on these invoices as claimed by the company is Rs.63,84,675
In terms of measures of association, how is Lambda different from the other measures used for nominal level data?
an exclusive club for top students has to elect a new president and treasure. there are 50 students in the club and all
there is concern about the percent of on-time flights. a recent survey of two major airlines yielded the following
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
State the hypotheses that can be used to determine whether the population proportions of delayed departures differ at these two airports and what is the point estimate of the proportion of flights that have delayed departures atChicago O'Hare?
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
a random sample of 160 commercial customers of paymor lumber revealed that 32 had paid their accounts within a month of
To determine whether this difference is significant, you collect data on the workout preferences for a sample of men and women at your gym.
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