(b)A random sample of twelve students were chosen, and their midterm test score (  y),  assignment score (x1), and missed classes (x2) were recorded as follows: Midterm Score, y Assignment Score, x1 Classes Missed, x2 85 65 1 + Ω 74 50 7 76 55 5 90 65 2 85 55 6 87 70 3 94 65 2 98 70 5 81 55 4 91 70 3 76 50 1 74 55 4

Mason is conducting a study on the effect of computer-based training on the math ability of seventh-graders. He randomly assigns one group of students to use a computer-based training method and another group of students to use workbooks. What type of analysis should be performed to determine if there is a difference between the two conditions?   Group of answer choices   A) paired samples t test   B) Pearson's correlation   C) independent samples t test   D) z test

A study was conducted to determine whether big-city and small-town dwellers differed in their helpfulness to strangers. In this study, the investigators rang the doorbells of strangers living in a large City or small towns in the vicinity. They explained they had misplaced the address of a friend living in the neighbourhood and asked to use the phone. The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes: Helpfulness to strangers   Admitted strangers into their home  Didnot admit strangers into their home  Big city dwellers 60 90 Small town dwellers 70 30 State the dependent and independent variable  Is this a directional or non directional

A random sample of ny 16 communities in western Kansas gave the following information for people under 25 years of age. X: Rate of hay fever per 1000 population for people under 25 119 129 92 123 112 93 125 95 125 117 97 122 127 88 A random sample of n 14 regions in western Kansas gave the following information for people over 50 years old. x2: Rate of hay fever per 1000 population for people over 50 94 108 100 97 111 88 110 79 115 100 80 114 85 96 A USE SALT (1) Use a calculator to calculate x, 1, 2, and s2. (Rqund your answers to four decimal places.) () Assume that the hay fever rate in each age group has an approximately normal distribution. Do the data indicate that the age group over 50 has a lower rate of hay fever? Use a0.05. (a) what is the level of significance? State the null and altermate bypotheses. Ho: H P H P2

Find the five-number summary of the scores in the Math 130 test pre-sented in Table 4.1, page 112. Draw the boxplot.

The college is planning to add a food vender in the student union and would like to know what type of food service the students would prefer. A sample of 120 students is obtained and each student is asked to select his/her preference from a coffee shop, a pizza place, or a hamburger grill. The resulting frequency data are as follows: coffee pizza hamburger 53 37 30 What is the critical value :

(b)A random sample of twelve students were chosen, and their midterm test score (  y),  assignment score (x1), and missed classes (x2) were recorded as follows: Midterm Score, y Assignment Score, x1 Classes Missed, x2 85 65 8 74 50 7 76 55 5 90 65 2 85 55 6 87 70 3 94 65 2 98 70 5 81 55 4 91 70 3 76 50 1 74 55 4     (i)What is the fitted multiple linear regression equation of the form ˆy = b0 + b1x1 + b2x2?  (ii)From part 6(b)(i) above, estimate the midterm test score grade for a student who has an assignment score of 60 and missed 4 classes.    (iii)Assume that the data on ( y, x1, x2) above in 6(b) is inputted into SPSS, with the following results:                                                                                                                                            ANOVA         Source SS df MS F…

The following test scores are for two classes that took the same test. (The highest possible score on the test was 60.) Class 1 (24 scores): 37, 46, 54, 55, 15, 55, 44, 55, 37, 26, 52, 44, 31, 23, 44, 52, 41, 41, 30, 50, 41, 41, 41, 41 Class 2 (25 scores): 50, 40, 40, 25, 40, 57, 31, 31, 40, 31, 33, 33, 57, 33, 34, 34, 57, 29, 34, 41, 41, 58, 41, 34, 45 Form a back-to-back stem and leaf plot with one stem. Put the leaves for one class on the right side of the stem and the leaves for the other class on the left side. Record the leaves in increasing order from the stem. Leaf (Class 1) Stem Leaf (Class 2) 3 2 1