A recent LA Times article reviewed recent research on Happin

A recent LA Times article reviewed recent research on Happiness (Often referred to as Life Satisfaction or Subjective Well-being). One question that came up was whether moving to a different state actually has an effect on happiness. Suppose that Dr. Altoni is trying to show that people who move to New York from the Midwest (Group A) generally are less happy after moving than people who move to Los Angeles from the Midwest (Group B).

Dr. Altoni picks random samples from each group (from a large group of people from the Midwest who plan to move to NY or LA). The results are summarized below, where the variable X represents is the movers\' score on a Happiness Scale:

Assume that both groups have approximately normal distributions and that both groups have equal variances.

movers to NY (Group A):   nA = 8              A = 100           SSA = 300         

                        movers to LA (Group B) : nB = 10          B = 107.2       SSB = 340         

6. The alternate hypothesis is in this case is H1: The ____________

A) population difference, uA-uB, is equal to 0

          B) population difference, uA-uB, is equal to -7.2

C) population difference, uA-uB, is less than 0

            D) sample difference, Xa-Xb is equal to 0

            E) sample difference, Xa-Xb, is equal to -7.2

7. The null hypothesis is in this case is H0: The ____________

A) population difference, uA-uB, is equal to 0

          B) population difference, uA-uB, is equal to -7.2

C) population difference, uA-uB, is less than 0

            D) sample difference, Xa-Xb, is equal to 0

            E) sample difference, Xa-Xb, is equal to -7.2

8. Using all of the information given, estimate the variance of each of the groups in the

       population.

       (Because there\'s only one estimate for both groups, this is called the \'pooled estimate\')

                      A) 40               B) 160                        C) 8                D) 3                E) 80

9. Using all of the information given, estimate the standard error of the sample difference,

      Xa-Xb, based on the data above

                        A) 6                 B) 3                 C) 12              D) 9                E) 1.5

10. If the null hypothesis is true, then the sampling distribution of Xa-Xb in this case has a

       mean of ____ and a standard deviation estimated to be _____

A) 0

Solution

my choose:

6A, 7A, 8D, 9C, 10B, 11A, 12D, 13C, 14D, 15B, 16B