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Question: Political polls typically sample randomly from the U.S. population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they feel about the President's handling of environmental issues. The results show that 575 out of the 1280 people polled say they either approve or strongly approve of the President's handling. Find a 95% confidence interval for the proportion of the entire voter population who approve or strongly approve of the President's handling. If the same sample proportion were found in a sample twice as large-that is 1150 out of 2560- how would this affect the confidence interval? How would the confidence interval change if the confidence level were 90% instead of 95%?
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
What proportion of the students had scores between 30 and 40?- What is the probability that a randomly selected student would score between 30 and 40?
scores on the act test for the 2010 high school graduating class had mean 21.0 and standard deviation 5.2. in all
Sometimes newspapers sample opinions of the local population by printing a "ballot" and asking readers to mark it and mail it in. Evaluate this sampling technique.
Drug Store News (September2002) provided data on annual pharmacy sales for the leading pharmacy retailers in the United States. Show a stem-and-leaf display.
Does achieving a high grade in reading cause an individual to earn a high grade in Statistics? Explain your answer with reference to the term lurking variable.
A computer program reports that for a 2-by-3 ANOVA, with 15 observations in each group, MSA = 400, MSB = 200, MSINTER = 200, MSWG = 50. Perform the tests of no main effects and no interaction with α = .01.
Sources and Uses of Cash. State how each of the following events would affect the firm's balance sheet. State whether each change is a source or use of cash.
Which of the following is not true about the t-distribution?
the national safety council released the following data on the incidence rates for fatal or lost-work time injuries
Present the results in a cross-tabulation table. What would be appropriate "independent" variable and dependent variable? Covert the 4G x Mobile Banking cross-tabulation table in answer A) into a percentage table
Assume salaries are normally distributed with a standard deviation of $4,500. What is the probability of a new graduate receiving a salary between $45,000.
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