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In an ABC News poll conducted between January 21 and 26, 2000, a random sample of n = 1006 adult Americans was asked, "Compared to buying things by mail order or in a store, do you think that buying things over the Internet poses more of a threat to your personal privacy, less of a threat, or about the same?" (https://www.pollingreport.com/ computer.htm, September 17, 2002). The percentages that selected each response wereMore of a threat: 40%Less of a threat: 7%About the same: 47%No opinion: 6%
a. What is the margin of error for this poll? Give your answer as both a proportion and a percentage.
b. What is a conservative 95% confidence interval for the population proportion that would have responded, "More of a threat?" Give your answer for the population percentage as well.
c. Write a sentence or two interpreting the interval that you found in part (b). d. Based on the interval you found in part (b), could you conclude that in January 2000 fewer than half of all adult Americans perceived Internet shopping as posing more of a threat than buying things by mail order or in a store? Explain.
a. Find the P-value to test the claim that the average time until first leakage for the huntingboot is at least 12 hours. b. Does this sample support A.C. Bone's claim at α = .05?
Find the sum of squares due to each of these two contrasts.- What null hypothesis is indicated by contrast 2? Test the hypothesis at a level of significance of 0.05 and explain your conclusions.
the following is a series of annual sales in millions of dollars over an 11-year period 2000 to 2010 year 2000 2001
Consider Obama's health care plan. There are = #s of males and females. 50% of the females approve (A) of the plan and 70% of the males do not approve (N) of the plan.
a real estate research firm monitors the cost of apartment rentals in a large newfoundland city. the mean rental rate
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The data show the amounts (in thousands of dollars) of the contracts for soft drinks in randomly selected local school districts. Ata = 0.10, can it be concluded that there is a difference in the averages? Use the P-value method
It is known that a healthy human body has an average temperature of 98.6?F, with a standard deviation of 0.95?F. Sixty healthy humans are selected at random. What is the probability that their temperatures average at least 99.1?F?
He would like to estimate with .05 of the true proportion with a confidence level of 90%. What is the sample size needed?
Assume the Alpha group had a standard deviation of $20 million and the Beta group had a standard deviation of $8 million. Construct a 95% confidence interval for the difference in mean portfolio size for firms in the two groups of credit ratings.
As discussed in Section 4.3, the algorithm in Figure 4.4 could use left or right-recursion to transform a repeated sequence of symbols into standard grammar form.
The Card structure below represents a playing card with a face value and a suit. Using the main code given, set the cards in the deck array to be one of each kind of playing card.
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