A Harris Poll conducted October 28, 2008 surveyed 2119 US adults who were asked

Question

A Harris Poll conducted October 28, 2008 surveyed 2119 US adults who were asked “when you think of rising health care costs, who do you think is most responsible?” One theory is that 50% of adults blame insurance companies, 10% blame pharmaceutical companies, 10% blame Federal and state governments, 10% blame hospitals, 10% blame physicians, 5% blame some other entity, and 5% are unsure who is most responsible. Actual survey responses follow:

At a 0.02 level of significance, do the actual results match the theoretical percentages?

Choose the correct HOand HA statements:

A) HO : pexpected = pobserved

HA: pexpected ? pobserved

B) HO :   Distribution of observed frequency percentages for healthcare blame FITS distribution of expected frequency percentages for healthcare blame

HA: Distribution of observed frequency percentages for healthcare blame DOES NOT FIT distribution of expected frequency percentages for healthcare blame (?)

C) HO :  Distribution of observed frequency percentages for healthcare blame DOES NOT FIT distribution of expected frequency percentages for healthcare blame (?)

HA: Distribution of observed frequency percentages for healthcare blame FITS distribution of expected frequency percentages for healthcare blame

D) HO : ?expected = ?observed

HA: ?expected ? ?observed

The most appropriate hypothesis test to use for this scenario is:

A) t - test for independent means

B) ?2test for independence

C) one-way ANOVA

D) ?2test for goodness-of-fit

E) two population proportion z - test

Most Responsible for Rising Health Care Number Costs Responding Insurance companies 869 Pharmaceutical companies 339 Government 338 Hospitals Physicians Other entity Not sure 127 85 128 233 Toce 2119 Total

Explanation / Answer

Sol:

these are categorical variables

random samples

Use chi sq test.

B) HO :   Distribution of observed frequency percentages for healthcare blame FITS distribution of expected frequency percentages for healthcare blame

HA: Distribution of observed frequency percentages for healthcare blame DOES NOT FIT distribution of expected frequency percentages for healthcare blame (?)

The most appropriate hypothesis test to use for this scenario is:

D)chi sq. test for goodness-of-fit

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