Determine whether the following value is a continuous random variable, discrete random variable, or not a random variable. a. The number of statistics students now doing their homework b. The hair color of adults in the United States c. The number of pigeons in a country d. The number of light bulbs that burn out in the next year in a room with 14 bulbs e. The amount of rain in City A during July f. The number of people in a restaurant that has a capacity of 200 a. Is the number of statistics students now doing their homework a discrete random variable, continuous random variable, or not a random variable? OA. It is a discrete random variable O B. It is a continuous random variable. OC. It is not a random variable. b. Is the hair color of adults in the United States a discrete random variable, continuous random variable, or not a random variable? O A. It is a discrete random variable. O B. It is a continuous random variable. O C. It is not a random variable. c. Is the number of pigeons in a country a discrete random variable, continuous random variable, or not a random variable? C O A. It is a discrete random variable. O B. It is a continuous random variable. O C. It is not a random variable. d. Is the number of light bulbs that burn out in the next year in a room with 14 bulbs a discrete random variable, continuous random variable, or not a random variable? OA. It is a discrete random variable. OB. It is a continuous random variable. OC. It is not a random variable. e. Is the amount of rain in City A during July a discrete random variable, continuous random variable, or not a random variable? OA. It is a continuous random variable. OB. It is a discrete random variable. O C. It is not a random variable.

K The population of ages at inauguration of all U.S. Presidents who had professions in the military is 62, 46, 68, 64, 57. Why does it not make sense to construct a histogram for this data set? Choose the correct answer below. O A. With a data set that is so small, the true nature of the distribution cannot be seen with a histogram. OB. There must be an even number of data values in the data set to create a histogram. OC. This data set would yield a histogram that is not bell-shaped. O D. Adequate class boundaries for a histogram cannot be found with this data set.

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3)   What graphs can help us identify a normal distribution? a. Dotplot b. Histogram c. Boxplot d. Normal probability plot pick one      a, b, c, d     b, c     a, b     a, b, c     b, d

3.  Can SAT scores predict college performance?  Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation.  A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58   The scatter diagram for the SAT score and GPA is given below:   (a)  Find the sample correlation coefficient r.  Truncate to two decimal places.  What does the value tell you about the data? (b)  Find the equation of the least squares line .  Truncate to four decimal places.  What does the slope mean? (c)  Find the value of the coefficient of determination .  Truncate to two decimal places.  What does this number mean? (d)  What is the predicted GPA if a computer science major got a…

The data on the right represent the number of traffic fatalities by seat location and gender. Determine P(female) and P(female/driver). Are the events "female" and "driver" independent? Determine P(female). P(female) = (Round to three decimal places as needed.) Driver Male Female Total 32,738 11,842 44,580 Passenger 6,346 6,395 12,741 Total 39,084 18,237 57,321

3.  Can SAT scores predict college performance?  Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation.  A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58   The scatter diagram for the SAT score and GPA is given below:   (a)  Find the sample correlation coefficient r.  Truncate to two decimal places.  What does the value tell you about the data? (b)  Find the equation of the least squares line .  Truncate to four decimal places.  What does the slope mean? (c)  Find the value of the coefficient of determination .  Truncate to two decimal places.  What does this number mean? (d)  What is the predicted GPA if a computer science major got a…

Determine whether each random variable is discrete or continuous. Answer only DISCRETE OR CONTINUOUS.a. The number of boys in a three-child family chosen at random.b. A cup of coffee served at a restaurant's temperature.c. The number of no-shows for every 100 commercial airline reservations.d. The number of automobiles owned by a household chosen at random.e. The average amount spent on electricity by a randomly selected household ineach state during the month of July.

Suppose a random sample of 800 athletes from the college are asked what their major is. The table below shows the results of the survey. Observed Frequencies of Majors from the Sample Observed Frequency Outcome Math/Science 256 Arts & Humanities 190 Business & Economics 153 Other 201 The distribution of majors at the college is shown in the second column of the table below. Fill in the expected frequencies. (Round to the nearest whole number). Frequencies of Majors at the College Expected Percent Outcome Expected Frequency Math/Science 18 Arts & Humanities 29 Business & Economics 25

A set of five different whole numbers are arranged in order from smallest to largest. The firstand last numbers are decreased by one. Which measure of spread for the set could thischange?a. The range. c. The standard deviation.b. The median. d) all of the above