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Question: In each situation, explain why you think that the sample proportion should or should not be used to estimate the population proportion.
a. An Internet news organization asks visitors to its website to respond to the question, "Are you satisfied with the president's job performance?" Of n = 3500 respondents, 61% say that they are not satisfied with the president's performance. On the basis of this survey, the organization writes an article saying that a majority of Americans are not satisfied with the president.
b. A convenience sample of n = 400 college students in two classes at the same university is used to estimate the proportion that is left-handed in the nationwide population of college students.
question the temperature in january is estimated to have a mean of 34 and a standard deviation of 6 in degrees
1. what percentage of people falls between -2 and 2 standard deviations on iq scores if the general population of iq
Can a pretest on mathematics skills predict success in a statistics course? The 82 students in an introductory statistics class took a pretest.
Juan decided to commit the company to a total quality management process if the data provided evidence that the process would lead to increased profitability.
suppose the cost of an observation varies from stratum to stratum where the cost of sampling a unit from stratum j is
Based on the sample data, and using the 0.025 level of significance, can we conclude that the new exhibit has increased the average contribution of exhibit patrons? Identify and interpret the p-value for the test.
Assume that probanility that dimond will be stolen is .005, and let x denote insurance company's profit. Compute insurance company's expected profit.
Please describe and define what the chi-square analysis is, the conditions under which it is used, and how it compares to the Pearson Correlation.
At 0.01 level of significance, can we conclude that there is a difference in textbook prices across the three different outlets? Show all the steps of the hypothesis testing.
Government units use which fund type to account for services provided to the general public on a user-fee basis?
Describe in some detail how a hypothesis test could be used in some real world context such as business, politics, church, Girl Scouts, school, or perhaps your place of work.
Compute an exponentially smoothing forecast using an alpha value of .30. Compute an adjusted exponentially smoothed forecast (alpha = .30 and beta= .20).
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