Test for a single sample but who is unfamiliar with

  • University of Phoenix
  • PSY 315
  • Homework Help
  • aletha190
  • 9
  • 93% (42) 39 out of 42 people found this document helpful

This preview shows page 4 - 8 out of 9 pages.

test for a single sample but who is unfamiliar with the t test for independent means.Hypothesis Test: Independent Groups (t test, unequal variance)Peach StreetPlum Street15.8680 18.2921 mean2.3306 2.5527 std. dev.1014n20df-2.42414 difference (Peach Street - Plum Street)1.00431 standard error of difference0hypothesized difference-2.41t.0255p-value (two-tailed)-5.28173 confidence interval 99. % lower0.43345 confidence interval 99. % upper2.85759 margin of error
$17.79 $17.96 $16.22 $23.92 $15.82 $15.87 $15.40 $16.47 $15.86 $15.96 $11.82 $16.79 $15.85 $16.74 $21.40 $20.57 $19.79 $14.83 x-bar = $15.87 $18.29 s = $2.33 $2.55 Data: n110n214x1-bar15.87x2-bar18.29s12.33s22.55(A) Formulate the hypotheses:Ho: μ1 = μ2Ha: μ1 ≠ μ2
(B) Decide the test statistic and the level of significance:
(C) State the decision Rule:
(D) Calculate the value of test statistic:
(E) Compare with the critical value and decide:
Ho
(F) Calculate the p- value for the test and interpret it:
3.Fry Brothers Heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. Assume the population standard deviation for Larry Clark is 1.05 calls per day, and 1.23 calls per day for George Murnen. A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days, George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean number of calls per day between the two

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture