b. What is the value of the observed test statistic associated with the hypothesis test? O z = 0.1283 O z = 0.0813 O t= 2.9400 = Z = 1.3961

A pipes manufacturer makes pipes with a length that is supposed to be 10 inches. A quality control technician sampled 39 pipes and found that the sample mean length was 10.05 inches and the sample standard deviation was 0.28 inches. The technician claims that the mean pipe length is not 10 inches. What type of hypothesis test should be performed? Select What is the test statistic? Ex: 0.123 What is the number of degrees of freedom? Ex: 20 Does sufficient evidence exist at the a = 0.05 significance level to support the Coloot v

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Words were displayed on a computer screen with background colors of red and blue. Results from scores on a test of word recall are given below. Use a 0.05 significance level to test the claim that the samples are from populations with the same standard deviation. Assume that both samples are independent simple random samples from populations having normal distributions. Does the background color appear to have an effect on the variation of word recall scores? Red Background Blue Background What are the null and alternative hypotheses? OA. H₂:0² = 0²/2 H₁:0² 20²/2 n Xx S 34 15.35 5.94 37 12.49 5.43 *C. H₂:0² = 0²/2 H₁:0² #0²/2 Identify the test statistic. F = 1.20 (Round to two decimal places as needed.) Use technology to identify the P-value. The P-value is (Round to three decimal places as needed.) *B. H₂: o² = 0² H₁:0² <0? OD. H₂:0² #0²/2 H₂₁:0² = 0²

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An Office of Admission document claims that 56% of UVA undergraduates are female. To test this claim, a random sample of 200 UVA undergraduates was selected. In this sample, 55.5% were female. Is there sufficient evidence to conclude that the document's claim is false? Carry out a hypothesis test at a 6% significance level. A. The value of the standardized test statistic:  Note: For the next part, your answer should use interval notation. An answer of the form (−∞,a)(−∞,a) is expressed (-infty, a), an answer of the form (b,∞)(b,∞) is expressed (b, infty), and an answer of the form (−∞,a)∪(b,∞)(−∞,a)∪(b,∞) is expressed (-infty, a)U(b, infty). B. The rejection region for the standardized test statistic:    C. The p-value is  D. Your decision for the hypothesis test:A. Reject H1H1.B. Do Not Reject H1H1.C. Reject H0H0.D. Do Not Reject H0H0.

What is the correct null hypothesis, H0, and alternative hypothesis, Ha, in symbolic form. (a) The mean height of all adult American males is 69 inches (5 ft 9 in). A researcher wonders if young American males between the ages of 18 and 21 tend to be taller than 69 inches. A random sample of 100 young American males ages 18 to 21 yielded a sample mean of 71 inches.

A newspaper claims that the mean time spent on physical activities by middle school children in UAE is less than 30 minutes per day. To test this claim, a random sample of 20 children was selected and yielded a test statistic of t=-2.15. What is the corresponding p-value of the test? 0.978 0.045 0.022 0.016

A home improvement company is interested in improving customer satisfaction rate from the 61% currently claimed. The company sponsored a survey of 130 customers and found that 88 customers were satisfied. What is the test statistic z? Ex: 2.22E What is the p-value? Ex: 0.123E Does sufficient evidence exist that the customer satisfaction rate is different than the claim by the company at a significance level of a = 0.05? Select ♥

Find the p-value for a right-tailed hypothesis test with a test statistic of z=-2.78