Confidence interval for a proportion with a margin
Determine the sample size needed to calculate a 95% confidence interval for a proportion with a margin or error of 10%.
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A study of college students show that 8 out of 12 students prefer a PC while 4 prefer Mac. Randomly select 2 students with no replacement between selections. Draw a tree diagram and place probablities on each branch.
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There are two major types of regression analysis-simple and multiple regression analysis. Both types consist of dependent and independent variables. Simple linear regression has two variables-dependent and independent. Multiple regression consists
Efficacy of a drug. Seventy-five (75) people with hypertension were given a new drug for the treatment of their condition. Blood pressure was lowered sufficiently to reduce the risk of serious outcomes in 20 of the 75 patients. In what proportion
Ten voters are randomly selected and asked if they will vote for the incumbent President. Five said yes and three said no. Two students are randomly selected with no replacement between the selections.
A student in the concrete lab, places 6 low strength concrete test cylinders (3500 psi) with a batch of 9 high strength conrete test cylinders (8000 psi): (show all calculations)
Identify the populations and parameters of interest. Then state hypotheses. State and verify conditions for carrying out a significance test. Calculate the test statistic and the P-value.
An opinion poll asks an SRS of 100 college seniors how they view their job prospects. In all, 53 say "Good." The plus four 98% confidence interval for estimating the proportion of all college seniors who think their job prospects are good is:
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