comes for childcare workers in Pennsylvania ane e of childcare workers in the state of Pennsylvan ced a random sample of 15 childcare workers fra report their mean annual income. The data obta Annual income in dollars 2, 46584, 54266, 53218, 56269, 52335, 53235, 6, 56638, 45390, 54321, 48214, 44924, 38383,

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 5E
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Carry your intermediate computations to at least three decimal places. (If necessary, consult a list of formulas.)

(a) State the null hypothesis 
H0
 and the alternative hypothesis 
H1
.
H0:
H1:
(b) Determine the type of test statistic to use.
  ▼(Choose one)
 
(c) Find the value of the test statistic. (Round to three or more decimal places.)
 
(d) Find the critical value at the 
0.10
 level of significance. (Round to three or more decimal places.)
 
(e) Can we support the claim that the mean annual income of childcare workers in Pennsylvania is greater than the mean annual income of childcare workers in Illinois?
A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Pennsylvania and Illinois. Due to recent trends in the childcare
industry, the firm suspects that the that the mean annual income of childcare workers in the state of Pennsylvania is greater than the mean annual income of
childcare workers in Illinois. To see if this is true, the firm selected a random sample of 15 childcare workers from Pennsylvania and an independent random
sample of 15 childcare workers from Illinois and asked them to report their mean annual income. The data obtained were as follows.
Annual income in dollars
Pennsylvania 54197, 46594, 57237, 43530, 41792, 48612, 46584, 54266, 53218, 56269, 52335, 53235, 53330, 42217, 36717
Illinois
49027, 45540, 40256, 43444, 31079, 45096, 56638, 45390, 54321, 48214, 44924, 38383, 50672, 35447, 46545
Send data to calculator
Send data to Excel
The population standard deviations for the annual incomes of childcare workers in Pennsylvania and in Illinois are estimated as 6400 and 6100, respectively. It is
also known that both populations are approximately normally distributed. At the 0.10 level of significance, is there sufficient evidence to support the claim that
the mean annual income, u,, of childcare workers in Pennsylvania is greater than the mean annual income, µ, of childcare workers in Illinois? Perform a one-
tailed test. Then complete the parts below.
Transcribed Image Text:A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Pennsylvania and Illinois. Due to recent trends in the childcare industry, the firm suspects that the that the mean annual income of childcare workers in the state of Pennsylvania is greater than the mean annual income of childcare workers in Illinois. To see if this is true, the firm selected a random sample of 15 childcare workers from Pennsylvania and an independent random sample of 15 childcare workers from Illinois and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars Pennsylvania 54197, 46594, 57237, 43530, 41792, 48612, 46584, 54266, 53218, 56269, 52335, 53235, 53330, 42217, 36717 Illinois 49027, 45540, 40256, 43444, 31079, 45096, 56638, 45390, 54321, 48214, 44924, 38383, 50672, 35447, 46545 Send data to calculator Send data to Excel The population standard deviations for the annual incomes of childcare workers in Pennsylvania and in Illinois are estimated as 6400 and 6100, respectively. It is also known that both populations are approximately normally distributed. At the 0.10 level of significance, is there sufficient evidence to support the claim that the mean annual income, u,, of childcare workers in Pennsylvania is greater than the mean annual income, µ, of childcare workers in Illinois? Perform a one- tailed test. Then complete the parts below.
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