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Suppose that in a certain population of married couples 30% of the husbands smoke, 20% of the wives smoke, and in 8% of the couples both the husband and wife smoke. Is the smoking status (smoker or nonsmoker) of the husband independent of that of the wife?
Use the definitional formula given below to find the derivative of the function.
Minutes of activity for lean people gad N(526, 107). Withink what limits do active minutes for about 95% of people in each group fall? Use the 68-95-99.7 rule.
A system consists of five identical components connected in parallel. Determine the reliability of the components such that the system reliabilty is 97%.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
ESPN reported in sample of 1000 homes the proportion of people who watched the Texas v. Ohio State college football game this weekend was .6.
Find the probability that a sample of 16 tires will have an average tire life of more than 52000 miles, give that the mean tire life is 50000miles and the standard Deviation is 8489.13.
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
The mean weight is 402.7 grams and the standard deviation 8.8 grams. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
If the amount of cosmic radiation to which a person is exposed while flying by jet across the US is a random variable having the normal distribution with µ=5.35 mrem, and σ = 0.59 mrem.
A researcher wants to see whether the stress of final exams elevates the blood pressure of freshman women. When they are not under any unusual stress, healthy 18 year olds have a systolic blood pressure that averages mean of 120 mm Hg with a stand..
The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe respondents' views of employment.
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
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