A hypothesis test for a population proportion p is given below: H0: p 0.40 Ha: p < 0.40 For each z-statistic, calculate the p-value for this hypothesis test. z-statistic = 0.00 . p-value = ?
a. 0.0000
b. 0.3085
c. 0.5000
d. 0.6915
Q. 2A group of 50 students had their blood pressures measured before and after watching a movie containing violence. The mean blood pressure before the movie is to be compared with the mean pressure after the movie. In general, blood pressure increases by 5 points after watching something violent happening with a standard deviation of 7 points. What is the standard deviation of the sampling distribution of the sample mean difference in blood pressure before and after watching a movie containing violence?
Q. 3A hypothesis test for a population proportion p is given below: H0: p 0.40 Ha: p < 0.40 For each z-statistic, calculate the p-value for this hypothesis test. z-statistic = 0.50 . p-value = ?
a. 0.0000
b. 0.3085
c. 0.5000
d. 0.6915
Q. 4A group of 50 students had their blood pressures measured before and after watching a movie containing violence. The mean blood pressure before the movie is to be compared with the mean pressure after the movie. In general, blood pressure increases by 5 points after watching something violent happening with a standard deviation of 7 points. What is the mean of the sampling distribution of the sample mean difference in blood pressure before and after watching a movie containing violence?
Q. 5A z-test for testing hypotheses about a population proportion is to be conducted. True or false: One condition for this z-test to be valid is that the sample size is adequately large enough.
a. True
b. False
Q. 6Scores on an English spelling test are determined for a sample of 16 5th graders both before and after they learn some new vocabulary tricks of the trade. In the population of difference scores it is know that students improve with an average of 3 points, with a standard deviation of 4 points, and that the distribution of the differences is approximately normal. What is the probability that the 16 students in the sample do not improve, on average? a
a. < 0.0001
b. 0.0013
c. 0.2266
d. 0.7500
Q. 7A z-test for testing hypotheses about a population proportion is to be conducted. True or false: One condition for this z-test to be valid is that the population of all responses has a Normal distribution.
a. True
b. False
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