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A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean score on the questionnaire for these 36 students is 70. The score for people in general on this questionnaire is 75, with a standard deviation of 12. Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
a. What is your null hypothesis? Alternate hypothesis?b. Is this a one-tailed or two-tailed hypothesis?c. What is your obtained z?d. What is the criterion z?e. Do you reject or fail to reject the null hypothesis?f. State in words what you have found.
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
What is the probability that between 90 and 100 employers provide a two-day paid Thanksgiving holiday? That is, what is the ?
What is the coefficient of x^5 in the polynomial -8x^5+0x^3+14? Find the slope of the line that contains points (-4,-2) and (1,1)
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
Find ten consecutive composite numbers. Find the prime factors of 1147 and of 1716. Are there any common factors?
510 people were asked which of four fast food restaurant were their favorite. Determine if there is a preference for any one place over any other.
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
Several factors influence the value obtained for a t statistic. Some factors affect the numerator of the t statistic and others influence the size of estimated standard error in the denominator.
A square yard of carpet is examined for surface defects. Currently, the process produces an average of 2.4 defects per square yard. What is the probability of finding 2 or more surface defects in the sample.
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
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