Numerade

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Clarissa Barr

Numerade educator

An education researcher claims that 54% of college students work year-round. In a random sample of 400 college students, 216 say they work year-round. At the level of significance being .05, is there enough evidence to reject the researcher's claim? Complete parts (a) through (e) below. (a) identify the claim and state H0 and Ha (b) find the critical value(s) and identify the reject region(s) z0=? (c) find the standardized test statistic z=? (d) reject or fail to reject null hypthesis? Is there enough evidence to support or reject the researchers claim?

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Keondre Parker

Numerade educator

Compute the standardized test statistic,x squared , to test the claim o squared=4.3 if n=12, s squared =3.6 and the level of significance = .05. A. 18.490 B. 12.961 C. 9.209 D. 0.492

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Lucas Finney

Numerade educator

Find the standardized test statistic to test the claim that u1 is greater than u2. Two samples are randomly selected from each population. The sample statistics are given below. n1=100, n2=125,x1=445 ,x2=430 ,o1= 45, o2=25 A. 2.81 B. 1.86 C. 0.91 D. 2.99

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Lucas Finney

Numerade educator

Find the critical values, t0 , to test the claim that u1=u2. Two samples are randomly selected and come from populations that are normal. The sample statistics are given below. Assume that o 2 over 1 does not equal 2 over 2 . Level of significance =.05 n1=25, n2=30,x1=25 ,x2=23 ,s1= 1.5,s2= 1.9 A. 1.711 B. 2.064 C. 2.797 D. 2.492

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Lucas Finney

Numerade educator

You wish to test the claim that u=1,290 at a level of significance of 0.01 and are given sample statistics n=35 and x=1260. Assume the population standard deviation is 82. Compute the value of the standardized test statistic. Round your answer to two decimal places.

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Clarissa Barr

Numerade educator

Use the figure to the right, which shows the percentages of adults from several countries who favor building new nuclear power plants in their country. The survey included random samples of 1124 adults from Country A, 1029 adults from Country B, 1000 adults from Country C, and 1075 adults from Country D. At the level of significance being .06, can you reject the claim that the proportion of adults in Country C who favor building new nuclear power plants in their country is greater than the proportion of adults from Country D who favor building new nuclear power plants in their country? Assume the random samples are independent. A bar graph has a vertical axis labeled from 0 to 100 in increments of 10. There are vertical bars with labels and heights in percentages as follows: Country A, 49; Country B, 48; Country C, 47; Country D, 36. Country A 49% Country B 48% Country C 47% Country D 36% Identify the claim and state H0 and Ha Find the standardized test statistic z= ? Calculate the p-value: Fail or reject? Support the orginal claim?

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Lucas Finney

Numerade educator

Test the claim about the difference between two population means u1 and u2 at the level of significance . Assume the samples are random and independent, and the populations are normally distributed. Claim: u1 is less than or equal to u2 ; .05. Assume o 2 over 1 is not equal to 2 over 2 Sample statistics: x1=2403, s1= 179, n1=13 and x2=2301, s2=54, and n2=9 What is the standardized test statistic t What is the p value Do I fail or reject this, is there enough evidence.

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Jon Southam

Numerade educator

Find the critical value(s) for the type of t-test with level of significance and sample size n. u= 20, =.01, n=12 a. 1.796 b. 2.201 c. 3.106 d.2.718

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Jacob Fry

Numerade educator

Suppose you want to test the claim that . Two samples are randomly selected from each population. The sample statistics are given below. At a level of significance of 0.02, when should you reject ? n1=51, n2=38,x1=2.2 ,x2=2.6 ,01= 0.76, 02=0.51

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Jon Southam

Numerade educator

Test the claim about the population mean at the level of significance . Assume the population is normally distributed. Claim: u is greater than 31; 0.05; standard deviation=1.2 Sample statistics: x=31.3 , n=50 A. Fail to reject . There is not enough evidence at the 5% level of significance to support the claim. B. Reject . There is enough evidence at the 5% level of significance to support the claim. C. There is not enough information to decide.

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Tori R.