16, A group of 100 students was surveyed about their interest in a new International Studies program. Interest was measured in terms of high, medium, or low. In the study, 30 students responded high interest, 40 students responded medium interest, and 30 students responded low interest. What is the relative frequency of students with high interest? .50 .30 .030 .40 17. You perform a hypothesis test at the .05 level of significance. Your computed p-value turns out to .042. What is your decision about the hypothesis? You can't render a decision unless you know the computed test statistic You would accept Ho You would accept Ho if it is a two-tailed test, but reject Ho if a one-tailed test You would reject Ho 18. The Director of Golf for a local course wants to study the number of rounds played by members on weekdays. He gathered the sample information shown below for 520 rounds. At the .05 significance level, is there a difference in the number of rounds played by day of the week? Day Monday Tuesday Wednesday Thursday Friday Rounds 124 74 104 98 120 Yes, because 2 = 15.308 No, because 2 = 7.715 Yes, because 2 = 12.288 No, because 2 = 11.793 19. coffee manufacturer is interested in whether the mean daily consumption of regularcoffee drinkers is less than that of decaffeinated-coffee drinkers. A random sample of 50 regular-coffee drinkers showed a mean of 4.35 cups per day, with a standard deviation of 1.2 cups per day. A sample of 40 decaffeinated coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. What is your computed zstatistic? z = -5.44 z = - 3.90 z = -2.45 z = -1.81 20, A study by the National Park Service revealed that 50% of the vacationers going to the Rocky Mountain region visit Yellowstone Park, 40% visit the Grand Tetons, and 35% visit both. What is the probability that a vacationer will visit at least one of these magnificent attractions? 0.55 0.05 0.35 0.95 21. University officials say that at least 70% of the voting student population supports a fee increase. If the 95% confidence interval estimating the proportion of students supporting the fee increase is [0.75, 0.85], what conclusion can be drawn? Seventy percent is not in the interval, so assume it will not be supported. The interval estimate is above 70%, so infer that it will be supported. Since this was not based on the population, no conclusion can be drawn. Seventy percent is not in the interval, so another sample is needed. 22. When a class interval is expressed as 100 up to 200, _________________________. The class interval is 99 Observations with values of 100 are excluded from the class Observations with values of 200 are included in the class Observations with values of 200 are excluded from the clas 23. Consider the following regression analysis between sales (Y in $1,000) and social media advertising (X in dollars). = 55,000 + 7X The regression equation implies that an: increase of $1 in advertising is associated with an increase of $62,000 in sales. increase of $7 in advertising is associated with an increase of $7,000 in sales. increase of $1 in advertising is associated with an increase of $7 in sales. increase of $1 in advertising is associated with an increase of $7,000 in sales 24. Each month the National Association of Purchasing Managers publishes the NAPM index. One of the questions asked on the survey to purchasing agents is: Do you think that the economy is expanding? Last month, of the 300 responses, 160 answered \"yes\" to the question. This month, 170 of the 290 responses indicated that the economy is expanding. If you're testing to find if a larger proportion of agents believe that the economy is expanding this month, what is your computed test statistic? z = -1.29 t = -1.07 z = -1.11 t = -1.25 25. In a distribution, the second quartile corresponds with the __________. Variance Median Mean Mode 26. hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the alternate hypothesis? H1: = 6.6 H1: > 7.6 H1: 6.6 H1: 6.6 27. The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. When you perform a test of hypothesis, what would be the resulting p-value? .0471 .0512 .0384 .0586 28. An example of a qualitative variable is _________________. Weight of a person Number of children in a family Color of ink in a pen Miles between oil changes 29. Which of the following is true regarding the normal distribution? It is asymmetrical. The mean, median, and mode are all equal. It has two modes. The points of the curve meet the x-axis at z = -3 and z = 3. 30. A group of women tried five brands of fingernail polish and ranked them according to preference. What level of measurement is this? Interval Ratio Ordinal Nominal