A one sample t-test was conducted on a population with M=75 and a sample with M=98....
Question Which of the following is true about the one sample z-test and one sample t-test: A. for a t-test, the population mean and standard deviation are needed for a t-test only the sample mean is needed. for a z-test the population mean and standard deviation are needed. The z and t-tests are identical except for the size of the sample used. The z and t-tests are identical in terms of the amount of information needed. B. C. D. E....
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A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
A one-sample z-test for a population proportion p will be conducted. Which of the following conditions checks that the sampling distribution of the sample proportion is approximately normal? The sample is selected at random. np0≥10 and n(1−p0)≥10 for sample size n. The sample size is less than or equal to 10 percent of the population size. I only A II only B III only C I and II only D I, II, and III
A researcher conducted a one-sample z-test, and found a significant effect with the sample mean equaling 24 (n = 20), the population mean equaling 19, and the population standard deviation equaling 5. What is the effect size using Cohen’s d? [G&W Chp. 8] Cohen’s d equals 0.33 Cohen’s d equals 0.66 Cohen’s d equals 1.00 Cohen’s d does NOT equal any of the above values.
A t-test should be used when: Select one: a. The population variance is known b. the population variance is unknown c. the sample size is small d. (a) and (c)
For a test of independent groups, a t test can still be conducted even when assumptions are violated, as long as you have: a. a random sample b. Equal sample sizes c. Sample size < 30 d. A known ceiling effect
For a test of independent groups, a t test can still be conducted even when assumptions are violated, as long as you have: a. a random sample b. Equal sample sizes c. Sample size < 30 d. A known ceiling effect
Compute the one sample Z-test for the following problems. A test is conducted for H0: μ = 40, with σ = 5. A sample size of 100 is selected X= 42.2 What is the null and alternative hypothesis for a 2-tailed test of significance? Compute the SEM for this problem. Compute the one Sample Z-test for this problem.
A) What is the appropriate test stat? N/A, z test, one sample
t test, independent samples t test, related samples t test?
B. What are the conditons? 1 and 2.
choices: beginning, weight, 2 months, healthy females, new
oral contraceptive
C. Compute test stat and make a decison.
critical value =
t stat =
decision:
D. Compute the CI
E. Cohens D=
r=
Magnitude sizes: trivial, small, med, or large
F. Make an interpretation based on results.
Signficant weight decrease...
Which Test those cases should use? A: one sample z-test B: one-sample t-test C: t-test for the difference between means for two related samples D: t-test for the difference between means for two independent samples with homogeneity of variance E: t-test for the difference between means for two independent samples with heterogeneity of variance F: a one sample z-test for proportions (or a chi-square goodness of fit) G: chi-square goodness of fit only (where a one sample z-test of proportions isn’t appropriate) H: a two-sample z-test...