For Z test population mean and standard deviation are needed.
Z=(-)/(/√n)
Hence the correct option is C
Ans: (C) for a Z test population mean and standard deviation are needed.
Question Which of the following is true about the one sample z-test and one sample t-test:...
Which of the following is a key difference between the t test and the z-test? a. The t test requires the knowledge of the true population mean. b. The t test uses the sample variance in place of the population variance. c. The t test computes the standard error using the population standard deviation. d. All of these are differences between t and z.
If a sample size (n) is small, a true effect (g., a true difference between the sample mean and population mean) might be __________ even though the true effect __________ . missed; is real missed; is not real detected ; is real detected; is not real There is no relationship between sample size and likelihood of missing the effect. Unlike a z-test, a one sample t-test can be used when: sample size is large population is not known to be...
A sample mean, sample size, and population standard deviation are provided below. Use the one-mean z-test to perform the required hypothesis test at the 10% significance level. x=37, n = 31, σ=9, H0 : μ=39, Ha: μ<39 EB Click here to view a partial table of areas under the standard normal curve. The test statistic is z- (Round to two decimal places as needed.)
You can use both the t-statistic and the Z-statistic to test hypotheses about the mean of a population. The test that uses the t-statistic is typically referred to as a t test, while the test that uses the z-statistic is commonly called a z test. IO Which of the following statements are true of the t-statistic and the t distribution? Check all that apply. The formula for the t-statistic is t = (x - 1) / s/vn. When the population...
2. One Sample t-test for Population Mean A vendor claims that the average weight of a shipment of parts is 1.84. The customer randomly chooses 64 parts and finds the sample has an average of 1.88 and standard deviation of 0.03. Should the customer reject the lot? Assume the customer wants to be 95% confident that the supplier's claim is incorrect before he rejects. (This is the same as the last example, except that 0.03 is the sample standard deviation...
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...
1. Fill in the blank. In a one-sample t-test, we use the _________ to estimate the population standard deviation in order to calculate the standard error. How do you find the degrees of freedom (df) for a one-sample t-test? a. N b. Calculate the standard deviation of the sample c. n-2 d. n-1 Which of the following influences the likelihood of obtaining significant results? a. The larger your estimated standard error, the more likely it will be to get...
1) Timothy has finished calculating a z-test. Now he turns to the table of z-scores to find the: a) Critical value b) Test value c) calculated value d) obtained value 2) Joyce has calculated a Z-test with an alpha set to .05. She calculates a z-value of 6.36. What can she conclude? a) none of these b) reject the null hypothesis c) fail to reject the null hypothesis d) the result is too close to call 3) In order to...
1. Which of the following statements is true about the standard deviation of X¯? A. It increases as the sample size n increases. B. It decreases as the sample size n increases. C. It changes each time a new sample is drawn. D. It does not change as the sample size n increases. 2. The standard deviation of the sampling distribution for a sample mean depends on the value(s) of A. neither the sample size nor the population standard deviation....
Which one the following statement is the required assumption for t-test? A large sample size. The data follow a normal distribution. A known population standard deviation. A small sample size.