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.
State the null and alternative hypotheses. (Let w = white,
and nw = nonwhite.)
A.) H0: μw =
μnw
Ha: μw ≠
μnw
B.) H0: μw ≤
μnw
Ha: μw >
μnw
C.) H0: μw >
μnw
Ha: μw ≤
μnw
D.) H0: μw ≠
μnw
Ha: μw =
μnw
E.) H0: μw ≥
μnw
Ha: μw <
μnw
Option A) is correct.
A.)
H0: μw = μnw
Ha: μw ≠
μnw................................Two tailed test.
The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for...
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...
How do I find the standard error? 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...
According to the Centers for Disease Control and Prevention, average life expectancy in the United States has risen to 77.6 years (source: cnn.com). It has been suggested that residents in rural areas of the Southwest have a shorter life-span than the general population. In a random sample of 250 recently deceased residents of the rural Southwest, the aver- age life span was 75.9 years with a sample standard deviation of 9.8 years. Is the sample evidence suffi- cient to reject...
According to the Center for Disease Control and Prevention (CDC), the mean life expectancy in 2015 for Hispanic males was 79.3 years. Assume that the standard deviation was 15 years, as suggested by the Bureau of Economic Research. The distribution of age at death, X, is not normal because it is skewed to the left. Nevertheless, the distribution of the mean, x, in all possible samples of size n is approximately normal if n is large enough, by the central...
According to the Center for Disease Control and Prevention (CDC), the mean life expectancy in 2015 for Hispanic females was 84.3 years. Assume that the standard deviation was 15 years, as suggested by the Bureau of Economic Research. The distribution of age at death, X, is not normal because it is skewed to the left. Nevertheless, the distribution of the mean, x, in all possible samples of size n is approximately normal if n is large enough, by the central...
3. The life expectancy of computer terminals is normally distributed with a mean of 5.2 years and a standard deviation of 8 months (2/3 years). Please answer the following questions. (a) What is the probability that a randomly selected terminal will last more than 6 years? (b) What percentage of terminals will last between 3.5 and 5.5 years?