# statistics

posted by .

A researcher wants to carry out a hypothesis test involving the mean for a sample
of n = 20. While the true value of the population standard deviation is unknown, the
researcher is reasonably sure that the population is normally distributed. Given this
information, which of the following statements would be correct?
A. The researcher should use the z-test because the population is assumed to be
normally distributed.
B. The t-test should be used because á and ì are unknown.
C. The t-test should be used because ó is unknown and the sample size is small.
D. The researcher should use the z-test because the sample size is less than 30.

• statistics -

## Similar Questions

1. ### Business Statistics

In a goodness-of-fit test, the null hypothesis states that the data came from a normally distributed population. The researcher estimated the population mean and population standard deviation from a sample of 500 observations. In addition, …
2. ### Statistics

I have a question that involves explaining what is wrong in each of the following situations: (a) A random sample of size 20 is taken from a population that is assumed to have a standard deviation of 12. The standard deviation of the …
3. ### statistics

Given a sample size of 38, with sample mean 660.3 and sample standard deviation 95.9 we are to perform the following hypothesis test. Null Hypothesis H0: ƒÊ = 700 Alternative Hypothesis H0: ƒÊ ‚ 700 At significance level 0.05 …
4. ### statistics

1.test wheter these samples represent populations that are different from the general population- sample of 10 with a mean of 44 and sample of 1 with a mean of 48. 2. The general population of individuals has a mean of 40 , a deviation …
5. ### Statistics

This is the first question..... For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3. This is the second question....For each of the following samples …
6. ### statistics

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with …
7. ### statistics

A researcher administered a treatment to a sample of participants selected from a population of 80. If the researcher obtains a sample mean of M=88. Which combination of factors is most likely to result in rejecting the null hypothesis?
8. ### statistics

Want to find if students who are musicians have higher Iq test scores than the general population. the researcher predicts that playing music is associated with higher IQ scores. the researcher selects a sample of 75 musicians from …
9. ### Statistics

Which of these statements is always true for a researcher who is using standard statistical methods in a test of significance?
10. ### statistics

In performing a hypothesis test, the null hypothesis is population mean = 6.9 and the alternative hypothesis is population mean ≠ 6.9, a random sample of 16 items is selected. The sample mean is 7.1 and the sample standard deviation …

More Similar Questions