A two-tailed test at a .0694 level of significance has critical z values of -1.96 and 1.96
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- 8.2 Q5 ignore this, just to rememebr what question it is.Use the following data to conduct a one-sample t test (with alpha = 0.05) to determine if the score on a standardized test (for scores that are normally distributed) with a known population mean of 100 is influenced by a new instructional method: 95, 105, 110, 90, 120, 110, 100, 95, 105, 125, 80, 100, 120 What is your critical t value? What is your sample standard deviation? What is your obtained t value? What do you conclude?The average test score at a university is 78 with a standard deviation of 5. A professor believes the average test score of students in his class is different form 78. If a sample of 102 students was selected with a sample mean score of 79.1 and our level of significance is set at .05: What is the standard error of the mean? What is the calculated test statistic (zobt). Compute effect size using Cohen’s d
- A researcher used a sample of n =16 adults between the ages of 40 and 45. For each person, the researcher recorded the difference between the ratings obtained while smiling and the rating obtained while frowning. On average the cartoons were rated as funnier when the participants were smiling, with an average difference of MD = 1.6, with SS = 135. Are the cartoons rated as significantly funnier when the participants are smiling ? Use a one-tailed test with α = .05. a. The null hypothesis in words is: b. The alternative hypothesis in symbols is: c. The critical t-value is d. The t-statistic is e. Your decision is f. Compute r2 to measure the size of the treatment effect. r2 is g. Report the results in APA. Include r2 as a measure of the effect size.Recently, a simple random sample of 572 adult males showed that 124 of them smoke. It has been established that in 2008. 20.4% of adults smoke. Use a 0.05 significance level to test the claim that the rate of smoking by adult males is now the same as in 2008. What is the value of the critical z tabular value?A repeated-measures analysis of variance for a study comparing three treatment conditions with a sample of n=20 participants, produces an F-ratio of F=6.40. Accet the F ratio at .05 but reject it at .01
- At a .05 “alpha level”, what is the “critical cutoff” z-score for a “two-tailed test”?A researcher conducted a repeated measures study comparing three treatment conditions. Refer to attached images and tale to answer a to d. Mean Std. Deviation N Treatment I 1.00 1.414 5 Treatment II 5.00 2.345 5 Treatment III 6.00 1.581 5 In APA format, report the F-ratio related to the treatment effect: Is this treatment effect significant? What is the partial η2 value for the treatment effect? Is this a weak, moderate, or strong effect?Nationally, patients who go to the emergency room wait an average of 6 hours to be admitted into the hospital. Do patients at rural hospitals have a lower waiting time? The 12 randomly selected patients who went to the emergency room at rural hospitals waited an average of 4.7 hours to be admitted into the hospital. The standard deviation for these 12 patients was 2.3 hours. What can be concluded at the the αα = 0.01 level of significance level of significance? For this study, we should use Select an answer z-test for a population proportion t-test for a population mean The null and alternative hypotheses would be: H0:H0: ? p μ Select an answer = > ≠ < H1:H1: ? p μ Select an answer = ≠ > < The test statistic ? z t = (please show your answer to 2 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? ≤ > αα Based on this, we should Select an answer accept reject fail to reject the null hypothesis.