Question

the manufacturing of jstcare automobile uses a random sample of 500 car owners to determeine if the proportion of satisfied caar owners is different for jetcare than for other cars
a)perform a hypothesis test t the 5 percent level if the sample contained 100 jetcare of whom 70 were satisfied and 400 other car owners of 320 were satisfied
b)what is implied by the test

Answer 1

Try a binomial proportion 2-sample test using proportions.

Hypotheses:
Ho: p1 = p2
Ha: p1 does not equal p2 -->this is a two-tailed test (the alternate hypothesis does not show a specific direction).

Remember you are using proportions; therefore, convert all fractions to decimals to make it easier to calculate your test statistic. Compare your test statistic to the cutoff 0.05 for a two-tailed test using the appropriate table. If the test statistic you calculate exceeds either the positive or negative cutoff value from the table, reject the null and conclude a difference. If the test statistic does not exceed either the positive or negative cutoff value from the table, do not reject the null (you cannot conclude a difference).

I hope these few hints will help get you started.