1. In a survey 7 out of 8 dentists recommend a ProTooth toothbrush. Based on this information, which can the toothbrush company predict about its recommendations? 1. A 2. E A. In a survey of 24 dentists, 18 of them will recommend a ProTooth toothbrush. B. In a survey of 40 dentists, 33 of them will recommend a ProTooth toothbrush. 4. F C. In a survey of 64 dentists, 56 of them will recommend a ProTooth toothbrush. D. In a survey of 88 dentists, 70 of them will recommend a ProTooth toothbrush. 5. A 3.

3. A mathematics placement test is given to all entering freshmen at a small college. A student who receives a grade below 35 is denied admission to the regular mathematics course and placed in a remedial class. The placement test scores and the final grades for 20 students who took the regular course were recorded as follows: Placement Test Course Grade | Placement Test | Course Grade 50 53 90 54 35 35 41 80 60 91 61 48 40 56 60 71 55 68 60 71 65 36 40 47 35 11 55 53 60 70 50 68 90 79 65 57 35 59 50 79 (a) Plot a scatter diagram. (b) Find the equation of the regression line to predict course grades from placement test scores. (c) Graph the line on the scatter diagram (d) If 60 is the minimum passing grade, below which placement test score should students in the future be denied admission to this course?

5. A representative sample of 50 students from a high school is surveyed. Each student is asked what science class he or she is taking. Science Class Physics Chemistry Biology No. of Students 6. 10 18 Earth Science 4 Health Sciences 12 Select all of the statements that are valid based on the survey results. a. About 20% of students at the high school are taking Chemistry. b. About twice as many students are taking Health Science than are taking Physics. c. For every 150 students we could predict that at least 18 of the students are taking Physics. d. For every 25 students we could predict that at least 4 of the students are taking Earth Science.

Determine whether the given description corresponds to an observational study or an experiment. In a study of 428 children with a particular disease, the subjects were given certain drugs to determine if the drugs have an effect on the disease. Does the given description correspond to an observational study or an experiment? A. The given description corresponds to an observational study. B. The given description corresponds to an experiment. O C. The given description does not provide enough information to answer this question.

9. A neighborhood watch association surveyed 40 neighbors about their feelings of safety in the neighborhood. They will survey an additional 80 neighbors. Based on the information, predict how many of the 80 neighbors will feel safe? RESPONSE NUMBER OF NEIGHBORS UNSAFE 12 NEUTRAL 10 SAFE 18 А. 39 С. 36 В. 24 D. 40

1. A new smart phone comes in five colors, two screen sizes and with four different data plans. In how many ways can this smart phone be ordered? A. 11 B. 40 C. 80 D. 440

23. Andrews Middle School has gathered data for their students' transportation to and from school. Method of Transportation Female Male Bus 94 102 Car 38 32 Walk 40 44 What is the frequency of students, in total, who ride a bus to and from school? O The frequency of students who ride the bus cannot be determined using the data in the table. 196 students 94 0.92(100) = 92%of students 102 102 students