An error that occurs because of chance is called: A) sampling error B) probabili
ID: 3260764 • Letter: A
Question
An error that occurs because of chance is called:
A) sampling error
B) probability error
C) mean error
D) nonsampling error
What is the critical value of z for the hypothesis test?
A) -2.33
B) -1.96
C) -2.17
D) -2.05
We can use the analysis of variance procedure to test hypotheses about:
A) two or more population means
B) the mean of one population
C) two or more population proportions
D) the proportion of one population
A researcher wants to test if elementary school children spend less than 30 minutes per day on homework. The alternative hypothesis for this example will be that the population mean is:
A) less than or equal to 30 minutes
B) not equal to 30 minutes
C) equal to 30 minutes
D) less than 30 minutes
For a one-tailed test, the p-value is:
A) the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
B) twice the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
C) twice the area under the curve between the mean and the observed value of the sample statistic
D) the area under the curve between the mean and the observed value of the sample statistic
Explanation / Answer
1. An error that occurs because of chance is called sampling error. So Option (A) is the correct choice. (Ans).
2. If we assume our level of significance = 0.01, and the test is left-tailed then the critical value of z for the hypothesis test will be -2.33. Hence Option (A) is the correct choice. (Ans).
3. Analysis of variance is used to test hypotheses about 2 or more population means. Hence Option (A) is the correct choice. (Ans).
4. The alternative hypothesis in this case will be population mean is less than 30 minutes. (Ans).
5. For a one-tailed test, the p-value is the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis. Hence Option (A) is the correct choice. (Ans).