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An analyst for a firm claims that their market-share has increased. In the past, about 35% of households used their product. To test the claim, they set up the following:
H0: p <= 0.35
H1: p > 0.35
To carry out the test at a significance level of 10%, the analyst took a random sample of households (sample size = 80), and found the sample proportion of households that used their product, and it was 25 out of 80. Compute the appropriate Z-stat.
What standard deviation (within 0.001 inch) minimizes the annual cost of producing elevator rails? You do not need to try standard deviations in excess.
What sample size (randomly selected from all taxpayers residing in each of neighborhoods 1 and 2) is required to generate a 90% confidence interval.
High temp for January 1st is normally distributed with a mean of 40 degrees and a standard deviation of 5 degrees.
Show the two distinct parse trees that can be constructed for if expr then if expr then other else other using the grammar given in Figure 5.17. For each parse tree, explain the correspondence of then and else.
Hiring. In preparing a report on the economy, we need to estimate the percentage of businesses that plan to hire additional employees in the next 60 days.
Twenty-seven of the 97 infants randomly assigned to hypothermia died and 41 of the 93 infants in the control group died.
Explain why you can't use the linear model you created in Exercise 22 to see when smoking during pregnancy will cease altogether.
Give 99% confidence interval for mean number of years general managers of major-chain hotels have spent with their current company.
an airline company is considering a new policy of booking as many as 178 persons on an airplane that can seat only 170.
To get a C in history, Nandan must average 74 on four tests. Scores on the first three tests were 69, 74, and 65. What is the lowest score that Nandan can get on the last test and still receive a C?
The annual income for 200 recently graduated business graduates is summarised in the frequency distribution which follows.
Let G be the event that a girl is born. Let F be the event that a baby over 5 pounds is born. Characterize the union and the intersection of the two events.
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