In an experiment, n = 35 are assigned to the control group, and n = 41 are assigned to the experimental group. What is the critical t value for alpha = .05, two-tailed test?
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In an experiment, n = 35 are assigned to the control group, and n = 41 are assigned to the experimental group. What is the critical t value for alpha = .05, two-tailed test?
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- A researcher did a one-tailed one-sample t-test to test the hypothesis that babies prefer the color blue over the color red. He collected a sample of 26 babies and presented them with a red plastic star and a blue plastic start for 12 seconds. The researcher measured the amount of time each baby spent watching the blue star out of the 12 seconds. What is the critical t value, assuming the alpha level used was .05?We plan to run a two-tailed t-test. Our sample size is 8, and we've decided upon an alpha level of 0.01. From the t-table, what is the t critical value(s)?If you have a two-tailed test with an alpha of .05, what is the critical value when n = 22? If you have a one-tailed test with an alpha of .05, what is the critical value when n = 158?
- Dr. Ingrid is conducting an experiment to see whether time spent reading is related to poor vision. To do so, she creates three groups and randomly assigns 17 participants to each: the first group reads for 30 min a day, the second group reads for 1hr a day, and the third group reads for 1.5 hrs a day. Dr. Ingrid plans on using a one-way ANOVA to analyze the results of her experiment. If Dr. Ingrid has set alpha to .01, what will be her critical value of F?Find the t-values that form the boundaries of the critical region for a two-tailed test with alpha of .05 for the n = 15You obtain a t comp of .975 in a two sample independent t test with alpha at .05. Is it significant?
- find the t value that form the boundaries of the critical region for a two-tailed test with alpha of .05 for n=15The median pH level of the rain in a certain county, was 4.90. A biologist obtains a random sample of 19 rain dates and obtains the following data. Test the hypothesis that the median pH level has decreased from 4.90 at the alpha= 0.05 level of significance.Determine the critical value of the chi square statistic for alpha = 0.05 with 30 degrees of freedom
- A survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27 had a history of intrapartum or postpartum infection. Can we conclude that the population proportion with a history of intrapartum or postpartum infection is significantly less than or equal to 0.25? Let alpha = 0.05.Using the z table, find the critical value (or values) for alpha = 0.12 right-tailed test.A nationwide study of undergraduate students reported that the mean number of drinks consumed per week during the spring semester is 7.96. The mean number of drinks consumed per week at USC is 7.64 (s.d.=2.55, N=412 Health services is concerned that USC students are consuming significantly more alcohol per week than the national average. Using an alpha level of .05, Is there sufficient evidence to be concerned? Be sure to select the correct critical value for the alternative hypothesis, and then use this evidence to make your conclusion