a) The test statistic here calculated is Z statistics because the distribution is normal and sample size is greater than 30.
X is the sample mean and sigma is the standard deviation
Z by formula calculated as
-1.04
b)The p value associated with the calculated Z score computed using Z table shown below.
As 0.2983
C) since the |Z| is less than Z critical and P vakuevis greater than alpha as 0.2983 hence we cannot conclude that mean is different.
d) Using 0.05 as level of significance the critical value of Z is 1.96
Rejection rule:
Reject Ho if Z is lower than the lower critical value and is greater than the upper critical value .
No, we cannot conclude that population mean is not equal to 15
Please find Z table
The first picture contains the whole thing. I went ahead and took additional pictures of each...
The first picture contains the whole math problem. I went ahead and took additional pictures of each problem I need answers for marked by a red X. For d, there’s a drop down for one of the part so please choose the correct answer. THANKS IN ADVANCE!!! Individuals fling federal income tax returns prior to March 31 received an average refund of $1,079. Consider the population of "last-minute" filers who mail their tax return during the last five days of...
3-7 Consider the following hypothesis test: Ho: u=15 Ha: u15 A sample of 40 provided a sample mean of 14.16. The population standard deviation is 6. Enter negative value as negative number. a. Compute the value of the test statistic (to 2 decimals) b. What is the p-value (to 4 decimals)? Use the value of the test statistic rounded to 2 decimal places in your calculations. c. Using a 0.05, can it be concluded that the population mean is not...
Consider the following hypothesis test: Ho: u = 15 Hai ji #15 A sample of 50 provided a sample mean of 14.15. The population standard deviation is 4. Enter negative value as negative number. a. Compute the value of the test statistic (to 2 decimals). -.03 b. What is the p-value (to 4 decimals)? Use the value of the test statistic rounded to 2 decimal places in your calculations. c. Using a = 0.05, can it be concluded that the...
Please provide the correct answers for the ones marked with a RED X near them Individuals filing federal income tax returns prior to March 31 received an average refund of $1,072. Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15) a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower...
Consider the following hypothesis test:H0 : μ = 16Ha : μ ≠ 16A sample of 50 provided a sample mean of 14.34. The population standard deviation is 7. a. Compute the value of the test statistic (to 2 decimals).b. What is the p-value (to 4 decimals)? c. Using α = .05, can it be concluded that the population mean is not equal to 1?d. Using α = .05, what are the critical values for the test statistic (to 2 decimals)?e. State the rejection...
Consider the following hypothesis test: H 0: = 15 H a: 15 A sample of 40 provided a sample mean of 14.33. The population standard deviation is 7. a. Compute the value of the test statistic (to 2 decimals). (If answer is negative, use minus “-“ sign.) -0.60 b. What is the p-value (to 4 decimals)? -1.2105 c. Using = .05, can it be concluded that the population mean is not equal to 15? Answer the next three questions using...
Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 60 provided a sample mean of 19.5. The population standard deviation is 2. a. Compute the value of the test statistic (to 2 decimals). If your answer is negative, use minus "-" sign. b. What is the p-value (to 3 decimals)? c. Using = .05, can it be concluded that the population mean is less than 20? SelectYesNoItem 3 d. Using = .05, what is the critical value for...
Individuals filing federal income tax returns prior to March 31 received an average refund of $1,077. Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15 a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers Develop appropriate hypotheses such that rejection of Ho will support...
{Exercise 9.09 (Algorithmic).} Consider the following hypothesis test: Ho: u 20 Ha: p < 20 A sample of 40 provided a sample mean of 19.6. The population standard deviation is 1.8. a. Compute the value of the test statistic (to 2 decimals). -1.64 b. What is the p-value (to 3 decimals)? -1.757 X c. Using a = .05, can it be concluded that the population mean is less than 20? No d. Using a = .05, what is the critical...
Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 55 provided a sample mean of 19.6. The population standard deviation is 1.6. a. Compute the value of the test statistic (to 2 decimals). If your answer is negative, use minus "-" sign. b. What is the p-value (to 3 decimals)? c. Using = .05, can it be concluded that the population mean is less than 20? d. Using = .05, what is the critical...