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A government association claims that more than 44% of adults in the United States do volunteer work. You work for a volunteer organization and are interested in analyzing this claim. You find that in a random sample of 1165 adults, 556 do volunteer work. (Round numeric answers to 3 decimal places and/or the nearest tenth of a percent unless otherwise specified.)
You wish to construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view.
1. What is the best point estimate for p?
2.What is the critical value, zc for this estimate?
3.What is the standard deviation of the sampling distribution?
Does this sample provide enough evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of the general population? Use a two-tailed test with α = .01.
Using the 0.05 level of significance, is there evidence that the population mean is above $170?
Could this information be viewed as representing the ratio scale of measurement? If so , explain why. If not, why not.
Over the past few years, banks have strongly promoted online banking and the paying of bills online. In 2003, about 50% of internet users paid bills online.
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
Is this correlation statistically significant? He also found the regression coefficient to be -1.66. Is this regression coefficient statistically significant? Explain why or why not for each.
Assuming a linear cost relationship, what are the regression coefficients, b0 and b1?
A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol over 200) is 30% in children 2-6 years of age. If 12 children are analyzed,
MATH1550H: Assignment: Question: A word is selected at random from the following poem of Persian poet and mathematician Omar Khayyam (1048-1131), translated by English poet Edward Fitzgerald (1808-1883). Find the expected value of the length of th..
Explain in detail and give an original example of the four types of probability.
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