A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hypothesis test, and the test produces z =-1.85. Based on this result, what is the correct statistical decision?O The researcher should reject the null hypothesis with either a = .05 or α = .01.O The researcher should reject the null hypothesis with a = .05 but not with α = .01.O cannot answer without additional informationO The researcher should fail to reject Ho with either a = .05 or α = .01.

Solution-: Given: ZStat=-1.85 (one tailed hypothesis) We want to find based on this result, what is…

Answered: A researcher expects a treatment to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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1.Distinguish p-value from alpha. 2. Which of the following alpha values provides the strongest evidence the reject the null hypothesis? a. 5%b. 1%c. 0.01% 3. Which approach measures the strength of the evidence against the null hypothesis, the p-value approach or the critical value approach?
Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant.a. Increasing the alpha level from .01 to .05. b. Changing from a one-tailed test to a two-tailed test. c. Increasing effect size.
Find the P-value for a left-tailed hypothesis test with a test statistic of z=−1.96. Decide whether to reject H0 if the level of significance is α=0.05.
Before the semester began, Professor Keithley predicted that 15% of hisphilosophy students would receive an A, 30% a B, 40% a C, 10% a D, and 5%an F. At the end of the semester, 14 of Professor Keithley’s philosophy studentsearned an A, 19 a B, 12 a C, 5 a D, and 2 an F.Use the Chi-Square test and a 0.05 level of significance to determine if ProfessorKeithley’s predicted percentages were accurate. (State your null and alternativehypothesis, find the critical values and test statistics, make a decision, and writea conclusion based on your results).
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below. Treatment A B C The null hypothesis for this ANOVA problem is Select one: OA. H1 H2 OB. H1 H2 H3 OC. H1 H2 H3 H4 OD. H1 H2= =12 Observation 22 20 30 22 26 40 30 222 25 33 20 28 28 22
Suppose that we have a problem for which the null and alternative hypothesis are given by: H0: μ = 88.5 ounces. H1:μ < 88.5 ounces. Is this a right-tailed test, left-tailed test, or two-tailed test. Find the z value based on a level of significance of α=.10.
The test statistic of z=1.50 is obtained when testing the claim that p≠0.427. Identify the hypothesis test as being two-tailed, left-tailed, or right-tailed. Find the P-value. Using a significance level of α=0.10, should we reject H0 or should we fail to reject H0? I am stuck on 2
What would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?
Find the P-value for a left-tailed hypothesis test with a test statistic of z= -1.02. Decide whether to reject Ho if the level of significance is α = 0.05. P-value= (Round to four decimal places as needed.) C
Observations from The null hypothesis is Ho: H1 = H, and the alternative hypothesis is as specified. The provided data are from a simple random paired sample from the two populations under consideration. Use the paired t-test to perform the required hypothesis test at the 10% significance level. Pair Population 1 Population 2 24 20 Hai Hy> H2 2 9 10 20 19 E Click the icon to view the t-table. 4. 13 8 5 8 14 14 7 10 15 8 22 28 Find the test statistic. Use population 1- population 2 as the difference. t=| (Round to three decimal places as needed.)
A researcher is conducting an experiment to evaluate the effectiveness of cognitive-behavioral therapy in treating eating disorders. The mean eating disorder score in clinical population of people suffering from the disorder is μ = 75. The results of the experiment will be examined by a z -test, two-tails. Which of the following is the correct statement of the alternative hypothesis, H1?A. μ = 75 (i.e., the treatment has a significant effect).B. μ ≠ 75 (i.e., the treatment has no significant effect).C. μ ≠ 75 (i.e., the treatment has a significant effect).D. μ = 75 (i.e., the treatment has no significant effect).
Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other actors are held constant. a. Increasing the alpha level from .01 to .05 b. Changing from a one-tailed test to a two-tailed test

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