Homework Answers
Since generally confidence level is taken at 5% i.e. α = 0.05
Since p > α, that means the null hypothesis can not be rejected and hence it can be said that promotion does increase sale significantly.
Option A is correct.
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Question A hypothesis test is done in which the null hypothesis is that the promotion increases...
State the null and alternative hypotheses for a hypothesis test, indicate whether the hypothesis test will...
State the null and alternative hypotheses for a hypothesis test, indicate whether the hypothesis test will be left-tailed, ng-tailed or two-tailed and clearly state the two possible conclusions that address the given claim A college professor claims that less than 25% of her students use their phones during class. Which of the following is the hypothesis test to be conducted? O A HOD=025 OBH, p<025 H 0.25 Hp.025 6 C Hạ P = ( 2% OD H:p02 H:p=025 HP<0.25 OL...
Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final...
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If p-value is 0.11 the null hypothesis can be rejected at a = .05. the null...
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Suppose a study is done to test the null hypothesis H0: μ = 100. A random...
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n = 42 observations results in x = 104 and
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(a) What is the null standard error in this case? (Round your
answer to three decimal places.)
(b) Plug numbers into the formula and enter the result in the
answer box. (Round your answer to three decimal places.)
Sample statistic
− Null value
Null standard
error
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A chi-square test is done in which you compare your data to a hypothesis of independent...
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4. A blood sample is analyzed by three labs to test the null hypothesis that the...
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State the null and alternative hypotheses for a hypothesis test, indicate whether the hypothesis test will be left-tailed, ng-tailed or two-tailed and clearly state the two possible conclusions that address the given claim A college professor claims that less than 25% of her students use their phones during class. Which of the following is the hypothesis test to be conducted? O A HOD=025 OBH, p<025 H 0.25 Hp.025 6 C Hạ P = ( 2% OD H:p02 H:p=025 HP<0.25 OL...
Identify the null hypothesis,
alternative hypothesis, test statistic, P-value, conclusion about
the null hypothesis, and final conclusion that addresses the
original claim. Use the P-value method. Use the normal
distribution as an approximation of the binomial distribution.
7. In a recent poll of 745 randomly selected adults, 585 said that it is morally wrong to not report all income on tax returns. Use a 0.01 significance level report all income on tax returns. Identify the null hypothesis, altemative hypothesis, test...
If p-value is 0.11 the null hypothesis can be rejected at a = .05. the null hypothesis can be rejected at a =.10. the null hypothesis can be rejected at a =.01. none of the above. 问题8 19 The test statistic for testing significance of the one regression coefficient follows Normal Distribution. Student's t-distribution. O F distribution. Chi-squared distribution. 问题9 19 The test statistic for testing significance of the overall regression model follows Normal distribution. Student's t-distribution. F distribution. Chi-squared...
Suppose a study is done to test the null hypothesis
H0: μ = 100. A random sample of
n = 42 observations results in x = 104 and
s = 11.
(a) What is the null standard error in this case? (Round your
answer to three decimal places.)
(b) Plug numbers into the formula and enter the result in the
answer box. (Round your answer to three decimal places.)
Sample statistic
− Null value
Null standard
error
(c) On the...
12. Consider a statistical inference that test the null hypothesis be Ho: c against H : esuch that c is a positive value. The test statistic associated with this mull hypothesis is given by t(b-c)/se(b) At significance level a, the test statistic is smaller than the critical value te(a/2, N - 2), that is iste(a/2, N- 2). Mark the correct alternative: (a) The test p-value increases if we increase c. (b) c does not belong to the estimated confidence interval...
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4. A blood sample is analyzed by three labs to test the null hypothesis that the blood matches that of a suspect. The resulting p-values from the labs are 0.60, 0.25, and 0.01, respectively. (a) If the lab test results are independent, can you reject the null hypothesis at the significance level 0.05? (b) If the three test results are positively correlated, would you reach the same conclusion? Why?
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