MATLAB: An Introduction with Applications
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ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Use an ANOVA with α = .05 to determine whether there are any significant differences among the three treatment
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- When we see an interaction effect in a one-way independent ANOVA, this refers to: The effect of the DV on the IV The effect of one IV on another IV The combined effect of the IVs on the DV The singular effect of one IV on the DVarrow_forwardA sample of colored candies was obtained to determine the weights of different colors. The ANOVA table is shown below. It is known that the population distributions are approximately normal and the variances do not differ greatly. Use a 0.025 significance level to test the claim that the mean weight of different colored candies is the same. If the candy maker wants the different color populations to have the same mean weight, do these results suggest that the company has a problem requiring corrective action? Source: DF: S: MS: Test Stat, F: Critical F: P-Value: 1.5962 Treatment: 8 0.016 0.002 2.3662 0.1403 Error: 75 0.075 0.001 Total: 83 0.091 Should the null hypothesis that all the colors have the same mean weight be rejected? O A. No, because the P-value is greater than the significance level. O B. Yes, because the P-value is greater than the significance level. O C. Yes, because the P-value is less than the significance level. O D. No, because the P-value is less than the…arrow_forwardA therapist would like to evaluate an intervention for treating depression. A sample of n = 20 depressed clients is obtained, and each person’s level of depression is measured using a standardized questionnaire before they begin the therapy program. Two weeks after therapy, each client’s level of depression is measured again. The average level of depression dropped by 4.0 points following therapy. The difference scores had a variance of 64. Identify and Cclculate the appropriate test statistic.Make sure to report the degrees of freedom for the statistical test (if appropriate). You must show your work to receive full credit. State your conclusions (use a two-tailed test with a = .05 for all tests). Compute an effect size.arrow_forward
- 3. The joint density function of X and Y is given by if 0 < z < 2,1 < y< 2 I+y S f(z, y) = 10 othereise. Calculate P(1 < X < 2 Y = 1.5). %3Darrow_forwardThe marketing research company comScore, Inc. reported that 65% of online searches in March 2010 used Google as the search engine. A network administrator wants to determine whether the percentage of searches that use Google is different in his company. He samples 400 searches and finds that 295 of them use Google. Can he conclude that the percentage of searches that use Google in his company differs from 65%? Use the α= 0.05 level of significance.arrow_forwardWhat is the test statistic and p-value? Because the P-value is ▼ greater less than the significance level 0.05, there ▼ is not is sufficient evidence to support the claim that there is a linear correlation between selling price (in hundred thousands) and the list price (in hundred thousands) of homes sold for a significance level of α=0.05.arrow_forward
- The following data were obtained from an independent-measures study comparing three treatment conditions. Treatment 1 2 3 n=6 n=6 n=6 M=1 M=2 M=6 SS=60 SS=65 SS=40 N= 18 G= 54 Sum of squares X^2= 411 Conduct an ANOVA with to determine whether there are any significant differences among the three treatment means. (alpha=.05)arrow_forwardFor what is two-way ANOVA used?arrow_forwardFind the critical value for a test for correlation with α = 0.01 for a sample size of 18.arrow_forward
- An analysis of variances produces dftotal = 16 and dfwithin = 14. For this analysis, how many treatment conditions are being compared?arrow_forwardA sample of colored candies was obtained to determine the weights of different colors. The ANOVA table is shown below. It is known that the population distributions are approximately normal and the variances do not differ greatly. Use a 0.05 significance level to test the claim that the mean weight of different colored candies is the same. If the candy maker wants the different color populations to have the same mean weight, do these results suggest that the company has a problem requiring corrective action? Source: DF: SS: MS: Test Stat, F: Critical F: P-Value: Treatment: 6 0.072 0.012 2.4011 2.2059 0.0341 Error: 86 0.430 0.005 Total: 92 0.502 Should the null hypothesis that all the colors have the same mean weight be rejected? A. No, because the P-value is greater than the significance level. B. Yes, because the P-value is greater than the significance…arrow_forwardA researcher wanted to examine whether type of dog food (freeze dried meat vs generic brand kibble) would affect dogs’ attention span. The researcher hypothesized that dogs who ate freeze dried meat would have longer attention spans than those who ate generic brand kibble. The researcher used a single sample of 13 subjects, that took part in both treatment conditions. The researcher set the alpha level at .01. The mean of the difference scores (MD)was 7.0 and the SSD for the difference in attention spans was 144. What is the calculated test statistic to the nearest thousandth? Be sure to put the positive or negative sign in front of it. Note: SHOW ALL WORK!!! Based on your work above, do you reject or retain the null? reject retain Based on your conclusion regarding the null, was there a treatment effect? Yes Noarrow_forward
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