-/2 points Baldistat3 18. E.528 XP My Notes Ask Your Teache The U.S. Center for
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-/2 points Baldistat3 18. E.528 XP My Notes Ask Your Teache The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard deviation of 12.7 years. Of the 82 nonwhites, the mean life span was 34.1 years with a standard deviation of 15.6 years. Conduct a hypothesis test to see ifthe mean life spans in the county were the same for whites and nonwhites Calculate the test statistic. (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) Select Calculate the p-value. (Round your answer to four decimal places, -1 points Baldistat3 18.E.530 XP. My Notes Ask Your Teache The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard deviation of 12.7 years. Of the 82 nonwhites, the mean life span was 34.1 years with a standard deviation of 15.6 years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites Does it appear that the means are the same? Why or why not? Yes, the means appear to be different because the hypothesis test has ap value greater than 0.025 Yes, the means appear to be different because the hypothesis test has a p-value greater than 0.05 No, the means appear to be different because the hypothesis test has a p-value less than 0.025 No, the means appear to be different because the hypothesis test has a p-value less than 0.05 No, the means appear to be different because the hypothesis test has a p-value greater than 0.05 -1 points Baldistat3 19 E.012. My Notes Ask Your Teache PTC is a substance that has a strong bitter taste for some people and is tasteless for others. The ability to taste PTC is inherited. About 74% of Italians can taste PTC, for example. You want to estimate the proportion of Americans who have at least one Italian grandparent and can taste PTC. Starting with the 7 estimate for Italians, how large a sample must you collect in order to estimate the proportion of PTC tasters within 10.05 with 90% confidence? Round your answer up to the nearest whole number.)Explanation / Answer
11.
n=514
x = 176
pcap = 176/514 = .342
The 90% Ci =
We know that Z value is 1.28 for 90% CI.
pcap +/- Z*sqrt(p*p'/n)
= .342 +/- 1.28*sqrt(.342*.658/514)
=.315 to .369
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