Homework Answers
option 4 is right option 1 os wrong because standard deviation does not matter for computing of power. optionn3 is wrong because we can calculate power for 1 tailed hypothesis also.
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D Question 7 1 pts To calculate the power of a statistical test, which of the...
Question 7 1 pts To calculate the power of a statistical test, which of the following...
Question 7 1 pts To calculate the power of a statistical test, which of the following conditions MUST be met? O Atwo-sided alternative hypothesis must be used The standard deviation of the population data must be the same as the standard error of the sample data O None are correct O Both the population data and the sample data must be normally distributed
For a sample of 200 entrepreneurs, a statistical test of their mean age has produced the...
For a sample of 200 entrepreneurs, a statistical test of their mean age has produced the following results: z=31-30/sqrt(25/200)=2.8284, P=0.002339 The sample mean of age is 31 years, its standard deviation is 5. What is the null hypothesis in this test and can this hypothesis be rejected? Why? How can you tell from these results whether a one-sided test been used or a two-sided test? What is the alternative hypothesis in this test ?
1. When do we use an independent groups t-test? a. b. c. d. When we are...
1. When do we use an independent groups t-test? a. b. c. d. When we are comparing means from one sample that has been measured twice. When we are comparing means from two different samples. When we are comparing a sample mean to a population mean. When we are comparing two population means. 2. Which of the following is true regarding the use of t-tests for true experiments versus quasi-experimental designs? a. b. We use the same t-test whether it...
Question 22 3 pts Suppose you are interested in testing a null hypothesis and the p-value...
Question 22 3 pts Suppose you are interested in testing a null hypothesis and the p-value associated with the test statistic is 0.004. As a result, you should o reject the null hypothesis at the 5-percent level of significance, but not at the 1- percent level of significance. do not reject the null hypothesis at the 5-percent level of significance, but do reject the null at the 1-percent level of significance. o do not reject the null hypothesis at the...
1. Which of the following will increase the value of the power in a statistical test...
1. Which of the following will increase the value of the power in a statistical test of hypotheses? (a) Increase the Type II error probability. (b) Increase the sample size. (c) Reject the null hypothesis only if the P-value is smaller than the level of significance. (d) All of the above 2. A significance test gives a P-value of 0.023. This means that the result is statistically significant at (a) both the 0.01 and the 0.05 levels. (b) neither the...
nutra/courses/_498545804_1/ct/outline 1) - Unit 114 Hypothesis Test for Mean Population Standard Deviation Unknown Critical Value Approach...
nutra/courses/_498545804_1/ct/outline 1) - Unit 114 Hypothesis Test for Mean Population Standard Deviation Unknown Critical Value Approach Understand the assumptions and conditions for using the best for hypothesis testing and compute the value of the test statistic Question If a hypothesis test were to be performed, in which of the following contexts would a t-test be appropriate? Select the correct answer below. A sample mean of 30 pounds and a standard deviation of pounds are obtained using a simple random sample...
Question 8 1 pts Which of the following is a reason to perform a statistical test?...
Question 8 1 pts Which of the following is a reason to perform a statistical test? O We suspect that an increase in one quantity is associated with a proportional increase or decrease in another quantity We suspect that the mean of two populations is the same All are correct We suspect that the mean of a population is positive
For which of the following is a t-test appropriate for performing a hypothesis test? Select the...
For which of the following is a t-test appropriate for performing a hypothesis test? Select the correct answer below: O A sample mean of 33 pounds and a standard deviation of 3 pounds are obtained using a simple random sample of 18 mountain bikes from the most popular bicycles offered by major retailers having approximately normally distributed weights. The population standard deviation is 2.4 pounds. O A simple random sample of 12 two-inch candles is taken from the candles offered...
Question 10 O pts BONUS QUESTION WORTH 10 points! TWO TAIL TEST: Suppose that a random...
Question 10 O pts BONUS QUESTION WORTH 10 points! TWO TAIL TEST: Suppose that a random sampleof 16 measures from a normally distributed population gives a sample mean of x 13.5 and a sample standard deviation of s-6. The Null Hypothesis is equal to 15 and the Alternate Hypothesis is not equal to 15. Using hypothesis testing for T values, do you reject the null hypothesis at alpha - 10 level of signingance? yes no maybe 23 not sure
6. Applying a statistical point estimate method and given the following data: Xbar=13.75mm, s=1.5mm, n=30. You...
6. Applying a statistical point estimate method and given the following data: Xbar=13.75mm, s=1.5mm, n=30. You estimate the population mean to equal: 7. The mean of a variable data set from a population is designated by: a) X bar, b) Greek letter Mu, c) Greek letter Sigma, d) s 8. In hypothesis testing- When alpha is defined as 0.2 the CI would be classified as this percentage: 9: Given the following sample data estimate: s=4, Xbar=10, Number of samples=100, Normally...
Question 7 1 pts To calculate the power of a statistical test, which of the following conditions MUST be met? O Atwo-sided alternative hypothesis must be used The standard deviation of the population data must be the same as the standard error of the sample data O None are correct O Both the population data and the sample data must be normally distributed
1. When do we use an independent groups t-test? a. b. c. d. When we are comparing means from one sample that has been measured twice. When we are comparing means from two different samples. When we are comparing a sample mean to a population mean. When we are comparing two population means. 2. Which of the following is true regarding the use of t-tests for true experiments versus quasi-experimental designs? a. b. We use the same t-test whether it...
Question 22 3 pts Suppose you are interested in testing a null hypothesis and the p-value associated with the test statistic is 0.004. As a result, you should o reject the null hypothesis at the 5-percent level of significance, but not at the 1- percent level of significance. do not reject the null hypothesis at the 5-percent level of significance, but do reject the null at the 1-percent level of significance. o do not reject the null hypothesis at the...
nutra/courses/_498545804_1/ct/outline 1) - Unit 114 Hypothesis Test for Mean Population Standard Deviation Unknown Critical Value Approach Understand the assumptions and conditions for using the best for hypothesis testing and compute the value of the test statistic Question If a hypothesis test were to be performed, in which of the following contexts would a t-test be appropriate? Select the correct answer below. A sample mean of 30 pounds and a standard deviation of pounds are obtained using a simple random sample...
Question 8 1 pts Which of the following is a reason to perform a statistical test? O We suspect that an increase in one quantity is associated with a proportional increase or decrease in another quantity We suspect that the mean of two populations is the same All are correct We suspect that the mean of a population is positive
For which of the following is a t-test appropriate for performing a hypothesis test? Select the correct answer below: O A sample mean of 33 pounds and a standard deviation of 3 pounds are obtained using a simple random sample of 18 mountain bikes from the most popular bicycles offered by major retailers having approximately normally distributed weights. The population standard deviation is 2.4 pounds. O A simple random sample of 12 two-inch candles is taken from the candles offered...
Question 10 O pts BONUS QUESTION WORTH 10 points! TWO TAIL TEST: Suppose that a random sampleof 16 measures from a normally distributed population gives a sample mean of x 13.5 and a sample standard deviation of s-6. The Null Hypothesis is equal to 15 and the Alternate Hypothesis is not equal to 15. Using hypothesis testing for T values, do you reject the null hypothesis at alpha - 10 level of signingance? yes no maybe 23 not sure
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