
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)
t-Test: Two-Sample Assuming Unequal Variances A two-sample test for means was conducted to test whether the mean number of movies watched each month differed between males and females. The Excel Data Analysis tool results are shown below. Female Male Mean 5.6 7.5 Variance 6.267 21.833 Observations 10 10 Hypothesized Mean Difference 0 DF 14 T Stat -1.133 P(T<=t) One-Tail 0.138 t Critical One-Tail 1.76 P(T<=t) Two-Tail 0.276 t Critical Two-Tail 2.144 a. Explain how to use this information to draw...
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...