MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Exam Name The bar graph shows the number of tickets sold each week by the garden club for their annual flower show. ) During which week was the most number of tickets sold? ) A) Week B) Week C) Week 5 D) Week ) The 995 payroll amounts for all major-league baseball teams are shown below. Answer the ) following question concerning this graph. What percentage of the payrolls were in the $0-0 million range? A) 0% B) 0% C) 8% D) 59%

2 ) The cost of five homes in a certain area is given. ) $,000 $5,000 $7,000 $,000 $,,000 Which measure of central tendency should be used? A) midrange B) mean C) mode D) median ) ) For the distribution drawn here, identify the mean, median, and mode. A) A = mean, B = mode, C = median B) A = median, B = mode, C = mean C) A = mode, B = mean, C = median D) A = mode, B = median, C = mean 5) Describe the shape of the histogram. The data set: ages of 0 cars randomly selected in a student 5) parking lot A) symmetric B) skewed to the left C) skewed to the right D) uniform ) The scores of the top ten finishers in a men's golf tournament are listed below. ) Find the mean. A) 7.7 B) 7. C) 5.5 D) 70.0

3 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 7) The number of home runs that Mark McGwire hit in the first years of his major league 7) baseball career are listed below. (Source: Major League Handbook) Make a stem-and-leaf plot for this data. 8) For the data below, construct a frequency distribution and a relative frequency 8) distribution. Height (in inches) Frequency ) The heights (in inches) of 0 adult males are listed below. Find the sample standard deviation. 9) A). B) 5.00 C).9 D) ) Last year batting averages in professional baseball averaged.9 with a high of. and a low of 0).7 (minimum 50 at-bats). Based on this information, which measure of variation could be calculated? A) standard deviation B) variance C) range D) percentile ) Health care issues are receiving much attention in both academic and political arenas. A sociologist ) recently conducted a survey of citizens over 0 years of age whose net worth is too high to qualify for government health care but who have no private health insurance. The ages of 5 uninsured senior citizens were as follows: Suppose the mean and standard deviation are 7.0 and 9.7, respectively. If we assume that the distribution of ages is bell shaped, what percentage of the respondents will be between. and 9. years old? A) approximately 8.9% B) approximately 8% C) approximately 8.5% D) approximately 95%

4 ) Find the z-score for the value 8, when the mean is and the standard deviation is 5. ) A) z =.80 B) z =.00 C) z = -. D) z =. ) A radio station claims that the amount of advertising per hour of broadcast time has an average of ) 7 minutes and a standard deviation equal to. minutes. You listen to the radio station for hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to minutes. Calculate the z-score for this amount of advertising time. A) z =.5 B) z = -0. C) z = -.5 D) z = 0. ) The test scores of 0 students are listed below. Find Q. ) A) 85 B) 8 C) 5 D) 8 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 5) The data below are the final exam scores of 0 randomly selected statistics students and 5) the number of hours they studied for the exam. Construct a scatter diagram for the data. Hours, x Scores, y Use the scatter diagrams shown, labelled a through f to solve the problem. ) ) a b

5 c d e f In which scatter diagram is r = 0.0? A) e B) f C) d D) c SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 7) Construct a scatter diagram for the given data. Determine whether there is a positive 7) linear correlation, negative linear correlation, or no linear correlation. x y ) The data below are the ages and systolic blood pressures (measured in millimeters of mercury) of 8) 9 randomly selected adults. Calculate the correlation coefficient, r. Age, x Pressure, y A) B) C) D)

6 9) Find the equation of the regression line for the given data. 9) x y A) ^y =.097x B) ^y = -0.55x C) ^y =.097x D) ^y = 0.5x ) Suppose x is a uniform random variable with c = 0 and d = 90. Find the probability that a 0) randomly selected observation exceeds. A) 0. B) 0.8 C) 0. D) 0.9 ) The highest point on the graph of the normal density curve is located at ) A) µ + B) Its mean C) µ + D) An inflection point ) Suppose a brewery has a filling machine that fills ounce bottles of beer. It is known that the ) amount of beer poured by this filling machine follows a normal distribution with a mean of. ounces and a standard deviation of 0.0 ounce. Find the probability that the bottle contains fewer than. ounces of beer. A).98 B).998 C).50 D).00 ) The amount of corn chips dispensed into a -ounce bag by the dispensing machine has been ) identified as possessing a normal distribution with a mean of.5 ounces and a standard deviation of 0. ounce. What chip amount represents the 7th percentile for the bag weight distribution? A). ounces B).09 ounces C).59 ounces D). ounces SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. ) The board of examiners that administers the real estate broker's examination in a certain ) state found that the mean score on the test was 57 and the standard deviation was 7. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. 5) The length of time it takes college students to find a parking spot in the library parking lot follows a 5) normal distribution with a mean of.5 minutes and a standard deviation of minute. Find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than.0 minutes. A).7 B).95 C).55 D).085

7 ) Find the z-score that is less than the mean and for which 70% of the distribution's area lies to its ) right. A) -0.7 B) -0.8 C) -0.5 D) A random variable X is normally distributed with µ = 0. Convert the value of X to a Z-score, if the standard deviation is as given. 7) X = 5; = 8 7) A) B) C) 8 D) - 8) The least squares regression line 8) A) Minimizes the mean difference between the residuals squared B) Maximizes the sum of the residuals squared C) Minimizes the sum of the residuals squared D) Maximizes the mean difference between the residuals squared 7