An experiment was conducted to determine whether the price of a golf club affected the distance a golfer could hit a golf ballA sample of 60 golfers were randomly assigned to one of two groups. Cor E The 30 golfers in group were given a club and told the price of the club was cheapthe 30 golfers in group E were given the same club told the price of the club was expensiveIn realitythere was no difference in price The golfers used their assigned clubs to hit a golf ball as far as they could The distance, in yards, that each golfer hit the golf ball was recorded and the mean distance calculated for each groupA - sample t-test for a difference in means will be conducted Which of the following statements are true? 1. The data were collected using random assignment 2. The data were collected using random selection 3. The distribution of the difference in sample means will be approximately normal

1 and 3 are true

Step-by-step explanation:

The data were collected using random assignment since the 60 golfers were randomly assigned to treatment groups, so statement 1 is true. It was not indicated that the 60 golfers in the sample were randomly selected, so statement 2 is not true. The distribution will be approximately normal since each group size is large enough, so statement 3 is true.

-2 is the right

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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