A temp agency makes a claim that eighty percent of their workers are placed within three days of signing up for a job. To test this claim, we take a sample of 150 workers and find that 117 of them were placed within 3 days. Is there enough evidence to conclude that the percentage is not equal to 80% at the 5% level of significance? (Round to 4 decimal places)
a. Is the test statistic for this test Z or t?
b. What is the value of the test statistic of the test? ( Enter 0 if this value cannot be determined with the given information.)
c. What is the pvalue of the test? (Enter 0 if this value cannot be determined with the given information.)
d. What is the relevant bound of the rejection region? (Enter 0 if this value cannot be determined with the given information.)
e. What decision should be made?
(Select one:
i. Accept the null hypothesis
ii. Do not reject the null hypothesis
iii. Can not be determined from given information
iv. Reject the null hypothesis)
A temp agency makes a claim that eighty percent of their workers are placed within three...
A study is done to test the claim that Company A retains its workers longer than Company B. Company A samples 16 workers, and their average time with the company is 5.2 years with a standard deviation of 1.1. Company B samples 21 workers, and their average time with the company is 4.6 years with a standard deviation of 0.9. The populations are normally distributed. hypothesis in symbolic form. determining the value of the test statistic. find the critical value...
1.) Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim. A researcher claims that 62% of voters favor gun control. Assuming that a hypothesis test to reject this claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms. Group of answer choices There is not sufficient evidence to support the claim that 62% of voters favor gun control. There is not sufficient evidence to...
Use the following to answer questions 1-4. The average house hold size in a certain region several years ago was 3.14. A sociologist wishes to test, at 5% level of significance, whether it is different now. Perform the test using the information collected by the sociologist; in a random sample of 75 households, the average size was 2.98 persons, with sample standard deviation 0.82 persons. 1. Set up the null and alternative hypothesis to test the researcher’s claim. a. ?0:?=2.98...
You wish to test the following claim ( H a ) at a significance level of α = 0.02 . H o : μ = 51.6 H a : μ < 51.6 You believe the population is normally distributed and you know the population standard deviation is σ = 8.7 . You obtain a sample mean of M = 49.3 for a sample of size n = 51 . What is the test statistic for this sample? (Report answer accurate...
An employment information service claims the mean annual pay for full-time male workers over age 25 without a high school diploma is $22,300. The annual pay for a random sample of 10 full-time male workers over age 25 without a high school diploma is listed. At α=0.05, test the claim that the mean salary is $22,300. Assume the population is normally distributed. 20,657 21,133 22,356 21,393 22,978 16,915 19,152 23,192 24,188 26,280 (a) Write the claim mathematically and identify H0...
For the folowing claim, find the null and alternative hypotheses, test statistic, critical value, and draw a conclusion. Assume that a simple random sample has been selected from a normally distributed population. Answer parts a-d. Claim: The mean IQ score of statistics professors is less than 119. Sample data: n 11, x 117, s 14. The significance level is ?-005 Click the icon to view a table of critical t-values. a. Choose the correct null hypothesis (Ho) and altenative hypothesis...
You wish to test the following claim (HQ) at a significance level of a = 0.02. For the context of this problem, id = 12 - 11 where the first data set represents a pre-test and the second data set represents a post-test. H:Hd = 0 Ha Hd 70 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n 13 subjects. The average difference...
A recent article reported that a job awaits only one in three (0.33) new college graduates. The major reasons given were an overabundance of college graduates and a weak economy. A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .01 significance level, can we conclude that a larger proportion of students at your school have jobs? A The Null Hypothesis is: a Job awaiting new college graduates is _______. b Job awaiting...
(a) Write the claim mathematically and identify H, and H, (b) Find the critical value(s) and identify the rejection region(s) (c) Find the standardized test statistic (d) Decide whether to reject or fail to reject the null hypothesis An environmental agency recently claimed more than 27% of consumers have stopped buying a certain product because of environmental concerns. In a random sample of 1000 consumers, you find 36% have stopped buying the product. At = 0.03, do you have enough...
You wish to test the following claim (Ha) at a significance level of a = 0.001. For the context of this problem, Hd = 42 Hy where the first data set represents a pre-test and the second data set represents a post-test. H:d=0 H:Hd < 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 21 subjects. The average difference (post- 4.2...