Mathematics, 12.08.2021 22:30 july00
A medical researcher wants to compare the pulse rates of smokers and non-smokers. He believes that the pulse rate for smokers and non-smokers is different and wants to test this claim at the 0.05 level of significance. A sample of 79 smokers has a mean pulse rate of 88, and a sample of non-smokers has a mean pulse rate of 84. The population standard deviation of the pulse rates is known to be 10 for smokers and 9 for non-smokers. Letµ1 be the true mean pulse rate for smokers and µ2 be the true mean pulse rate for non-smokers.
a. State the null and alternative hypotheses for the test.
b. Compute the value of the test statistic. Round your answer to two decimal places.
c. Find the p-value associated with the test statistic. Round your answer to four decimal places.
d. Make the decision for the hypothesis test and state your conclusion.
Answers: 1
Mathematics, 22.06.2019 01:20, blackboy21
1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed
Answers: 2
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