A statistics instructor at a large western university would like to examine the relationship (if any) between the number of optional homework problems students do during the semester and their final course grade. She randomly selects 12 students for study and asks them to keep track of the number of these problems completed during the course of the semester. At the end of the class each student's total marks is recorded along with their final grade. The data follow in Table 2. Table 2 Course Grade Problem 51 62 58 62 65 68 66 66 68 67 76 77 78 78 84 85 72 73 72 78 73 76 75 91 vii. Use the regression equation to preaict a student's final course grade if 75 optional homework assignments are done. Use the regression equation to compute the number of optional homework ix. assignments that need to be completed if a student expects an 85.

Males 74 75 69 72 75 73 88 76 71 64 67 71 72 82 71 83 82 78 80 81 75 Females 75 57 61 71 79 78 81 65 57 80 73 83 86 79 65 70 69 76 55 66 79   5.  Construct stem-and-leaf plots for each data set using four stems. You should have two separate plots: one for men and one for women. 6.  Why is it important to have the same stems for both plots, even though one plot has an empty stem? 7.  Comment on the distributions. What type on conclusions can you make about the heart rates of males and females? Do they appear to be very different?

For a statistics class project, Jonathan and Crystal held an ice-cream-eating contest. They randomly selected 29 males and 35 females from their large high school to participate. Each student was given a small cup of ice cream and instructed to eat it as fast as possible. Jonathan and Crystal then recorded each contestant's gender and time (in seconds), as shown in the dotplots. : ● Male Female 15 75 90 105 30 45 60 Time to eat ice cream (sec) Do these data give convincing evidence of a difference in the population means at the a = 0.10 significance level? State appropriate hypotheses for performing a significance test. Be sure to define the parameters of interest. = Ho: M1 M2 = 0, Ha M₁ −μ₂ > 0, where μ₁ = the true mean time it takes male students to eat a small cup of ice cream and μ₂ = the true mean time it takes for female students to eat a small cup of ice cream. Ho: M1 - M₂ = 0, Ha M₁ M₂ < 0, where μ₁ = the true mean time it takes male students to eat a small cup of ice cream and…

For each vignette, choose the type of research that is being conducted. There is only one correct answer for each vignette. Here are your answer choices for questions 1-18   Case Study                                                                       Naturalistic Observation Laboratory Observation                                                Survey Correlation                                                                      Test Experiment                                                                      Longitudinal Design Cross Section                                                                   Cross Sequential Design   Maria wants to understand the political demographics in her community, so she creates a questionnaire asking people to identify their age, gender, political affiliation, religion and marital status. After Maria collects the abovementioned data (in question #12), she then identifies the relationships between religion and political affiliation. Kathi…