Can money buy happiness? A researcher wanted to determine whether there was any association between economic status and happiness. She selected a sample of 1000 adults and interviewed them.
Each person was asked about their financial situation and their level of happiness was evaluated. The researcher analyzed the results to determine whether there was an association between economic status and happiness. A) cross-sectional; Information is collected at a specific point in time.
B) cohort; Individuals are observed over a long period of time.
C) retrospective; Individuals are asked to look back in time.
Q. 2If one card is drawn from a standard 52 card playing deck, determine the probability of getting a jack, a three, a club or a diamond. Round to the nearest hundredth.
A) 0.58 B) 0.65 C) 0.50 D) 0.15
Q. 3The probability that an individual has 20-20 vision is 0.1. In a class of 10 students, what is the mean and standard deviation of the number with 20-20 vision in the class?
A) mean: 1; standard deviation: 0.9486833 B) mean: 10; standard deviation: 0.9486833
C) mean: 1; standard deviation: 1 D) mean: 10; standard deviation: 1
Q. 4A survey of 100 fatal accidents showed that in 43 cases the driver at fault was inadequately insured. Find a point estimate for p, the population proportion of accidents where the driver at fault was inadequately insured
A) 0.43 B) 0.57 C) 0.754 D) 0.301
Q. 5Vitamin D is important for the metabolism of calcium and exposure to sunshine is an important source of vitamin D. A researcher wanted to determine whether osteoperosis was associated with a lack of exposure to sunshine.
He selected a sample of 250 women with osteoperosis and an equal number of women without osteoperosis. The two groups were matched - in other words they were similar in terms of age, diet, occupation, and exercise levels. Histories on exposure to sunshine over the previous twenty years were obtained for all women. The total number of hours that each woman had been exposed to sunshine in the previous twenty years was estimated. The amount of exposure to sunshine was compared for the two groups. A) retrospective; Individuals are asked to look back in time
B) cross-sectional; Information is collected at a specific point in time.
C) cohort; Individuals are observed over a long period of time.
Q. 6If one card is drawn from a standard 52 card playing deck, determine the probability of getting a ten, a king or a diamond. Round to the nearest hundredth.
A) 0.37 B) 0.40 C) 0.31 D) 0.29
Q. 7A quiz consists of 50 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers.
A) mean: 10; standard deviation: 2.82842712 B) mean: 10; standard deviation: 3.16227766
C) mean: 25; standard deviation: 2.82842712 D) mean: 25; standard deviation: 5
Q. 8When 385 junior college students were surveyed,170 said that they have previously owned a motorcycle. Find a point estimate for p, the population proportion of students who have previously owned a motorcycle.
A) 0.442 B) 0.558 C) 0.791 D) 0.306
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