Stats Test 1-4

The histogram below displays the frequencies of waiting times, in minuets, for 175 patients in a dentists office. Which of the following could be the median of the waiting times? a. 2.50 b. 7.25 c. 12.25 d. 15.00 e. 17.50

7.25

Rodger claims that the two statistics most likely to change greatly when an outlier is added to a small data set are the mean and the median. Is Rodger's claim correct? a. Yes, both the mean and median are likely to change greatly b. No, only the mean is likely to change greatly. c. No, only the median is likely to change greatly d. No, neither the mean nor the median are likely to change greatly e. There is not enough information to determine if the mean or median is likely to change greatly

b. No, only the mean is likely to change greatly.

One way to measure the duration of subterranean disturbances such as earthquakes and mining is to calculate the root-mean-square time. The following histograms summarize the distributions of the root-mean-square times for 2 sources of disturbances. Based on the histograms, which of the following correctly compares the two distributions? a. The median of the earthquake disturbances is equal to the median of the mining disturbances b. The median of the earthquake disturbances is less than the median of the mining disturbances. c. The range of the earthquake disturbances is equal to the range of the mining disturbances d. The range of the earthquake disturbances is less than the range of the mining disturbances e. The mode of the earthquake disturbances is equal to the mode of the mining disturbances

b. the median of the earthquake disturbances is less than the median of the mining disturbances.

At a local ice cream store, 210 people were surveyed on whether they preferred eating ice cream from a cup or cone. Of the 210 people surveyed, 70 were adults and 140 were children. Of the responses, 150 indicated the con as the preferred method of eating ice cream. For those surveyed there was no association between age and preferred method of eating ice cream. Which of the following tables shows the distribution of these responses?

c.

The histogram shown summarizes the responses of 100 people when asked, "What was the price of the last meal you purchased?". Based on the histogram, which of the following could be the IQR? a. $40 b. $21 c. $10 d. $5 e. $3

d. $5

in a certain school district, students from grades 6 through grade 12 participate in a school-sponsored community service activity. The following bar chart shows the relative frequencies of students from each grade who participate in the community service activity. Which of the following is supported by the bar chart? a. The greatest number of participating students was in grade 9 b. The number of participating students in grade 6 was equal to the number of participating students in grade 7 c. The relative frequency of all participating students in grades 6 and 7 combined was 0.60 d. Grade 12 had the least relative frequency of participating students e. Grade 11 had the highest relative frequency of participating students

d. Grade 12 has the least relative frequency of participating students

The following histogram summarizes the amount spent on plane tickets to travel home, in dollars, for a group of 30 college students. If the interval size is decreased from $200-$100, which of the following must remain the same on the new histogram? a. The height of the bars b. The widths of the bars c. The number of bars d. The sum of the frequencies e. The shape of the distribution

d. The sum of frequencies

Grain moisture is a characteristic of grain that affects the price paid for the grain. A random sample of 28 loads of corn was evaluated for moisture as a percent of the total weight. A different random sample of 28 loads of soybeans was also evaluated for moisture. The data are displayed in the dot plots below. a. The first quartile b. the median c. the third quartile d. the range e. the interquartile range

d. the range

Janelle collected data on the amount of time in minutes each person in a large sample of customers spent in a local store. The data also included recording the gender of each customer. These data were used to generate the boxplots shown. Which of the following statements is true? a. the range in the amount of time in minutes in the sample of costumers spent in the store is approximately 40 minutes. b. The mean amount of time in minutes males in the sample of customers spent in the store is approx. 20 min. c. The third quartile of the amount of time in minutes males in the sample of customers spent in the store is approx 45 min d. The interquartile range of the amount of time in minutes females in the sample of customers spent in the store is 15 min e. Approximately half of the males in the sample of customers spend at least as much time in the store as any female in the sample of customers

e. Approximately half of the males in the sample of customers spend at least as much time in the store as any female in the sample of customers

As a part of a science experiment, a student recorded 10 measurements of the temperature of a liquid. One of the measurements was an outlier compared with the other nine measurements. Which of the following must be true about the other nine measurements, excluding the outlier, when compared with the 10 measurements? a. The median of the 9 measurements is less than the median of the 10 measurements b The median of the 9 measurements is greater than the median of the 10 measurements c. The maximum of the 9 measurements is less than the maximum of the 10 measurements d. The maximum of the 9 measurements is greater than the maximum of the 10 measurements e. The standard deviation of the nine measurements is less than the standard deviation of the 10 measurements

e. The standard deviation of the nine measurements is less than the standard deviation of the 10 measurements