Purchase Solution

Hypothesis Testing: One-tailed and Two-tailed Testing

Not what you're looking for?

Ask Custom Question

I've been trying to understand the differences between one tailed and two tailed testing, t and z testing and p value. I think I understood #5 but need some help with #18, 23 and 44.

18. The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?

23. Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution. In an effort to increase their weight, a special additive is added to the chicken feed. The subsequent weights of a sample of five-month-old chickens were (in pounds):

4.41 4.37 4.33 4.35 4.30 4.39 4.36 4.38 4.40 4.39

At the .01 level, has the special additive increased the mean weight of the chickens? Estimate the p-value.

44. A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in percent):

4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6

At the .01 significance level, can we conclude that the 30-year mortgage rate for small banks is less than 6
percent? Estimate the p-value.

See attached file for full solution.

Attachments
Purchase this Solution
Solution Summary

This solution provides calculations in Excel for the differences between one-tailed and two-tailed testing.

Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

View More Free Quizzes
Related BrainMass Solutions

  • P-Value for Hypothesis Testing Situations

    The two-tailed P value equals 0.0843, so the required one-tailed p-value is 0.0843/2 = 0.042155 This solution finds the p-value for each of the hypothesis-testing situations.

  • Multiple choice questions on testing of hypothesis

    b. a one-tailed test should be utilized. c. a two-tailed test should be utilized. d. None of the above. Answer: b. a one-tailed test should be utilized.

  • Introduction to Hypothesis Testing

    264010 Introduction to Hypothesis Testing Introduction to Hypothesis Testing State the claim mathematically. Then write the null and alternative hypothesis. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed.

  • Hypothesis Testing: Unemployment Levels

    (p ≠ 0.086) c) Classify the hypothesis test as two-tailed, left-tailed or right-tailed This is a two-tailed test, since there is no direction specified for the test. The solution discusses hypothesis testing and unemployment levels.

  • Hypothesis Testing using a Z-Test for Film

    a) What is your null hypothesis? Alternate hypothesis? Null Hypothesis H0: mean = 75 Alternate Hypothesis Ha: mean is not equal to 75 b) Is this a one-tailed or two-tailed hypothesis? Two-tailed test c) What is your obtained z?

  • Measurement Scale Types, Test Stats & Probability

    How would you arrive at a probability value (given in the z-score table) to reflect a two-tailed hypothesis? How would you arrive at a probability value to reflect a one-tailed hypothesis?

  • Hypothesis Testing: Critical Values and Decision Making Problems

    A two-tailed hypothesis test with critical values of ±2.33 and a test statistic for the sample of -2.56. 5. A one tailed hypothesis test with a critical value of 1.383 and a test statistic for the sample of 1.625. 6.

  • Statistics - One-tailed or Two-tailed Test

    192005 Statistics - One-tailed or Two-tailed Test 1) How can you tell, from a verbal hypothesis statement, whether you are conducting a one-tailed or two-tailed test?

  • Capital punishment law: Null and research hypotheses

    I will provide the null and research hypotheses and Type 1 and Type 2 errors for both two-tailed and one-tailed hypothesis testing situations.

  • Test a hypothesis : key informaiton

    The sample mean is 2.59 and the sample standard deviation is 0.66. Conduct the following test of hypothesis using the .08 significance level. H0: u1<=u2 H1: u1 > u2 a. Is this a one-tailed or a two-tailed test? Solution.

View More Related Solutions