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Suppose a survey is taken of two groups of people where each person is asked a yes/no question and the proportion of people who answer yes is calculated for each group. Which of the following is true about a hypothesis test of the difference in the two proportions?
a) The t-distribution should be used if the standard deviations are unknown.
b) The standard deviation must be assumed equal.
c) Normality can be assumed if the sample size for each population is at least 30.
d) Normality can be assumed if, in each group, at least 5 people say yes, and at 5 people say no.
What is the correlation between student anxiety scores and number of study hours? Select alpha and interpret your findings. Make sure to note whether it is significant or not and what the effect size is.
Keith's Florists has 16 delivery trucks, used mainly to deliver flowers and flower arrangements in the Greenville, South Carolina, area. Of these 16 trucks, 7 have brake problems. A sample of 6 trucks is randomly selected. What is the probability ..
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Standard deviation of 6.9 centimeters.assuming that the heights are recorded to the nearest half-cm, how many of these students would you expect to have heights less than 160.0 centimeters.
an urn contains 4 white and 4 black balls. we randomly choose 4 balls without replacement this constitutes one trial.
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take 3 arrays as input: one containing the student responses, the second containing the answer key, and the third containing the scores for the questions,
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Sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
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