MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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(a) | State the null hypothesis
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(b) | Determine the type of test statistic to use. | |
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(c) | Find the value of the test statistic. (Round to three or more decimal places.) | |
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(d) | Find the p-value. (Round to three or more decimal places.) | |
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(e) | Can we support the claim that the |
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- An electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 58 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviation(millivolts) A 186 2 B 185 3 What type of hypothesis test should be performed? What is the test statistic? Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the α=0.1 significance level?yes or noarrow_forwardWhat are the variables, what scale of measurement is each variable (nominal,ordinal,or continuous). Then state the null and alternative hypothesis in words.arrow_forwardTest Prep. A GRE prep company claims that average score improvement of their students is equal to 50 points. We randomly sample 40 students of their average improvement is 47 points with a standard deviation of 37 points. Evaluate the company's claim using a hypothesis test. Use a 5% level of significance. (a) Write the hypotheses for the test: OHo: H = 50 Hạ: p 47 %3D O H,: µ = 50 Ha: p > 50 %3D OHo: H = 47 Ha: p = 47 (b) Compute the p-value for the test: p = |(round to three sig figs) (c) What is the final conclusion? O There is not sufficient evidence to reject the company's claim. O There is sufficient evidence to support the company's claim. O There is not sufficient evidence to support the company's claim. O There is sufficient evidence to reject the company's claim. Question Help: M Message instructor D Post to forum Submit All Parts Jump to Answerarrow_forward
- Test the indicated claim about the means of two populations. Assume that the two samples are randomly selected, independent, the population standard deviations are not know and not considered equal. Subjects are given a creativity exercise on a computer with either a red background or a blue background. The scores are shown in the table. At the 0.01 significance level, test the claim that blue enhances performance on a creative task. Red Background Blue Background n1 = 41 n2 = 44 xˉx̄1 = 19.2 xˉx̄2 = 18.7 s1 = 0.88 s2 = 0.35 What are the correct hypotheses? (Select the correct symbols and use decimal values not percentages.)H0: Select an answer μ(blue) s₁² μ₂ p₂ p̂₁ σ₁² p μ₁ x̄₂ μ x̄₁ p₁ ? < ≥ ≠ ≤ = > Select an answer p₁ μ s₁² σ₁² μ₂ p₂ x̄₁ p̂₁ μ(red) μ₁ p x̄₂ H1: Select an answer x̄₁ x̄₂ p₁ μ₁ μ μ(blue) p p₂ σ₂² s₂² p̂₂ μ₂ ? ≤ < = ≥ ≠ > Select an answer σ₁² x̄₂ p₁ x̄₁ μ₁ p p₂ μ μ₂ p̂₁ s₁² μ(red) Original Claim = Select an answer H₁ H₀ df = Based on…arrow_forwardSuppose a friend of yours was interested in comparing the meanreading scores of four ethnic groups in her classroom but has no idea what statistical procedure to use. So, she comes to you for advice since she knows you recently completed a statistics course. Your friend tells you that each group has 8 students. Given this information: (1) State the null and alternative hypotheses for this study (2) What is the dependent and independent variable for this study (3) What test statistic/hypothesis test would you select to determine if the means are significantly difference at the alpha .05 level?arrow_forwardANSWER D, E, AND F ONLY NO HANDWRITTEN ANSWERS. HARD TO UDNERSTANDarrow_forward
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