If the z-value is within the critical region, what should be done with the hypothesis?
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- A researcher decides to lower the alpha level that determines the critical region(s) prior to conducting a hypothesis test. This will increase the power of the hypothesis test. True or False?What is the difference between the critical value of z and the observed value of z?What is the significance of R and R2 in gression model?
- Vitamin A was administered to children in third world countries to decrease mortality rates. Two hundred children received vitamin A and 160 children did not receive vitamin A. The mortality rate for the Vitamin A group was 6% (12 out of 200). The mortality rate for the No Vitamin A group was 9.375% (15 out of 160). Are these proportions significantly different? Do a hypothesis test by calculate the chi-square statistic. Then state the appropriate critical value; then come to a conclusion concerning the null hypothesis; and then state what this means with regards to Vitamin A and mortality rates. You must explain every single step you take or no credit. Let the significance level equal 5%.Is the statement below correct? Explain."The calculated t-value is greater than the critical T-value from the table, hence we reject the null hypothesis, therefore the alternative hypothesis is correct."In which situation cointegration test can be performed? Write down its null Also, refer the given table and interpret the results?
- A veterinarian claims that the mean weight of adult German shepherd dogs is 75 pounds. The test statistic is -2.01 when a researcher applied hypothesis test to test a veterinarian's claim at ?=0.05α=0.05. Find the critical value(s) and state the conclusion.Determine the kurtosis if the data given is a sample.Like father, like son: In 1906, the statistician Karl Pearson measured the heights of 1078 pairs of fathers and sons. The following table presents a sample of 6 pairs, with height measured in inches, simulated from the distribution specified by Pearson. Father's Son's height height 69.3 71.4 66.7 68.8 70.7 71.0 65.7 70.9 72.4 69.1 65.4 66.0 Send data to Excel = 41.2733 are known for this data. Use the critical value method to test The least-squares regression line y = bo+b,x=50.5230+0.2781x and E (x-. H:B,=0 versus H, : B, #0. Can you conclude that the father's height is useful in predicting the son's height? Use the a=0.01 level of significance. Part 1 of 4 Find the critical value(s). Round the answer to three decimal places. If there is more than one critical value, separate them with commas. DEC 10 MacBook DII DD F10 888 F8 F9 F7