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)
A t-test should be used when: Select one: a. The population variance is known b. the...
To An independent-measures t hypothesis test is appropriate when the value for a is known a. b. the mean for a treated group of subjects is compared to a known population mean C. one sample is used to test a hypothesis about one population P there are two separate samples containing different subjects 17. One sample of n 5 scores has a variance of s 10 and a second sample of n= 10 scores has s pooled variance is computed...
QUESTION 13 The t distribution should be used whenever a. the population is not normally distributed. b. the sample standard deviation is used to estimate the population standard deviation. c. the sample size is less than 30. d. the population standard deviation is known.
The t test is used when the standard deviation of the population is known. True False
Consider a normally distributed population with unknown variance ơ2. To test the null hypothesis that σ2 is equal to σ. we collect a sample of size n form the population and then calculate the sample variance S2. It is well known that we would fail-to-reject the null hypothesis if the following holds: 1-2n-1n-1 Note: χ2.v is such that P(x:Xp.v), and χ is a chi-squared random variable with v degrees of freedom. Use the above result to develop a hypothesis testing...
14. (4 points) Given the following information, caleulate Sg, the pooled sample variance that should be used in the pooled-variance t test 416 6,25 C.S:-4 D.sg-5.23 А.sg-6 B.sj-5 15. (5 points) If standard deviation σ is unknown, the population is normally distributed, and the sarmple size n is small. What kind of confidence interval should we use for population mean μ?
The AIC is a statistic Select one: a. used to help a researcher chose the number of lags in a time series with multiple predictors b. that is used as an alternative to the BIC when the sample size is small (T < 50) c. often used to test for heteroskedasticityonly used in cross-sectional analysis d. all of the above/below
in the t test for independent groups, the unbiased estimate of the population variance _______. select all that apply. a. s1 2 alone b. s2 2 alone c. a weighted average of s1 2 and s2 2 d. (ss1 + ss2)/(n1 + n2 -2) I know "d" is accurate but wondering if c is also. that is s1 squared and s2 squared, I believe.
10. In an independent-samples t test, the ________ is used rather than the ________. Select one: A. standard deviation; pooled variance B. variance; pooled variance C. pooled variance; standard deviation D. standard deviation; variance 11. Dr. Jameson wanted to know if IQ scores differed between male and female participants in his study. He gave 28 participants an IQ test and then compared IQ scores for gender differences. He hypothesized that there would be a statistically significant gender difference in IQ...
If I want to reduce the variance in the sampling distribution when conducting a t test, what should I do? Group of answer choices Increasing sample size. Raising the alpha level for hypothesis testing. Measuring the true population variances. Ensuring that the two samples have the same variance.
1. The T distribution can be use when comparing two population with population variance unknown. True False 2. You may use the Normal distribution when comparing two population with population variance known. True False