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Do male college students spend more time than female college students using a computer? This was one of the questions investigated by the authors of the paper "An Ecological Momentary Assessment of the Physical Activity and Sedentary Behaviour Patterns of University Students" (Heath Education Journal [2010]: 116-125). Each student in a random sample of 46 male students at a university in England and each student in a random sample of 38 female students from the same university kept a diary of how he or she spent time over a three-week period. For the sample of males, the mean time spent using a computer per day was 45.8 minutes and the standard deviation was 63.3 minutes. For the sample of females, the mean time spent using a computer was 39.4 minutes and the standard deviation was 57.3 minutes. Is there convincing evidence that the mean time male students at this university spend using a computer is greater than the mean time for female students? Test the appropriate hypotheses using α = 0.05
1. the following table represents the u.s. sources of electrical
They found that children who averaged more than two hours of television viewing per day when they were younger than 3 tended to score lower on measures of reading ability and short term memory. Is the study described an observational study or an e..
If a random sample of 40 voters is chosen, approx. the probability that more than 20 favor this candidate. Use the normal approximation to the binomial with a correction for continuity.
the reliability of a computer system is often measured in terms of life-length of a specific hardware component. in
To evaluate the effect of a treatment , a sample of n=9 is obtained from a population with a mean of m=40 and the treatment is administered to the individuals is found to be M-33
Can Economic Theory Explain Piracy Behavior?," published online in 2003 by Berkeley Electronic Press, reports results for the survey question
Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product.
a multiple choice quiz consists of 50 questions each with 4 possible answers. find the mean for the number of correct
The objective of the interview is to determine the office product buying plans of the company in the coming year. Develop a personal interview form that asks both issue-related questions as well as demographic questions.
QModify your reverse procedure of exercise 2.18 to produce a deep-reverse procedure that takes a list as argument and returns as its value the list with its elements reversed and with all sublists deep-reversed as well. For example,
The mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
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