Tuesday

March 3, 2015

March 3, 2015

Posted by **Sheila** on Friday, April 20, 2012 at 7:20pm.

- Statistics -
**MathGuru**, Friday, April 20, 2012 at 7:38pmTry a proportional one-sample z-test for this one since this problem is using proportions.

Here's a few hints to get you started:

Null hypothesis:

Ho: p ≥ .90 -->meaning: population proportion is greater than or equal to .90

Alternate hypothesis:

Ha: p < .90 -->meaning: population proportion is less than .90

Using a formula for a proportional one-sample z-test with your data included:

z = .88 - .90 -->test value (352/400 = .88) minus population value (.90) divided by

√[(.90)(.10)/400] --> .10 represents 1-.90 and 400 is sample size.

Finish the calculation. Remember if the null is not rejected, then there is no difference. If you need to find the p-value for the test statistic, check a z-table. The p-value is the actual level of the test statistic. Otherwise, check a z-table for a one-tailed test at .05 level of significance. Compare to your test statistic. If the test statistic exceeds the value from the table, reject the null and conclude p < .90. If the test statistic does not exceed the value from the table, do not reject the null.

I hope this will help.

- Statistics -
**Sheila**, Friday, April 20, 2012 at 8:33pmThanks MathGuru! Makes a ton more sense now!

- Statistics -
**Srinivas**, Monday, August 13, 2012 at 7:49pmMathGuru,

/****

statistic. Otherwise, check a z-table for a one-tailed test at .05 level of significance. Compare to your test statistic. If the test statistic exceeds the value from the table, reject the null and conclude p < .90. If the test statistic does not exceed the value from the table, do not reject the null.

****/

I think you got the opposite.

Decision rule should be--> Accept Ho if test statistic >= -1.645

**Answer this Question**

**Related Questions**

Algebra - Ms. Jones has two job offers as a car salesperson. At one dealership, ...

Statistics - A survey of 100 mayonnaise purchasers showed that 65 were loyal to ...

Organizational Psychology - How should companies mesh vision and goals with the ...

calculus - An automobile with seven years of use has a commercial value of $...

calculus - X. An automobile with seven years of use has a commercial value of $...

statistics - If 50% of the automobiles sold by an agency for a certain car are ...

MAT201 Basic Statistics - A dealership sold 15 cars last month. The purchase ...

Brief Calculus - Last one for today... As the financial consultant to a classic ...

Statistics - A confidence interval was used to estimate the proportion of ...

statistics - Dr. Snyder teaches a large introductory statistics course. In the ...