Degrees of freedom is 28, and significance level is 2.5%, the critical value of X2 from the table is: (Write the three decimals)
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- LICENSE x ED COURSE, PART 3 of 4. What is the chi-square critical value (a = 0.05)?The following 2 X 2 chart represents whether high school students passed the road test for their driver’s license on the first attempt by whether they took a driver’s education course. What is the chi-square critical value (a = 0.05) ?A) Compute the corresponding effect size(s) and indicate magnitude(s). d= / Magnitude = r2 = / Magnitude = B) Compute the appropriate test statistic(s) to make a decision about H0. critical value = test statistic= d= / Magnitude = r2 = / Magnitude = C) Compute the appropriate test statistic(s) to make a decision about H0 critical value = test statistic= d= / Magnitude = r2 = / Magnitude =using the z table (table e), find the critical value (or values) for each. a. alpha=0.10, two tailed test b. alpha=0.01, right tailed test c. aplha=0.005, left tailed test
- The standard pH of a drinking water of MRWD is pH 7.0, the pH obtained from several water station are as follows: Station 1 7.8 Station 2 6.5 Station 3 5.8 Station 4 8.9 Station 5 6.8 Station 6 5.8 Station 7 9.0 Station 8 6.9 Test the hypothesis that the drinking water of the MRWD is safe for drinking.The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected. Mixing Technique Compressive Strength (psi) Observations 1 3129 3000 2865 2890 2 3200 3300 2975 3150 3 2800 2900 2985 3050 4 2600 2700 2600 2765 (a) Test the hypothesis that mixing techniques affect the strength of concrete. Use α=0.05. Calculate to 2 decimal places f0: Does mixing technique affect concrete strength? (b) Find to 2 decimal places the P-value for the F-statistic computed in part (a). P-value = (c) Analyze the following residual plots to determine model adequacy. Does the assumption of normality seem reasonable? Does the assumption of constant variance seem reasonable?a. Determine the positive critical value Z* corresponding to:i. 87.64% confidence.ii.95.34% confidence.iii. 57.04% confidence.b. Which of these three z* values is largest? Which is smallest?The largest Z* value is the one associated with_____ %.The smallest Z* value is the one associated with____ %.
- The quality inspector of a certain factory states that 3% of outgoing products have major defects. A sample of 200 products have 5 defective products. Is there strong evidence that the statement of the quality inspector is true? Use ?=0.05 Find the: Parameter of interest: ? Null hypothesis: ? Alternative hypothesis: ? Test statistic: ? Reject H0 if: ? Computations: ? Conclusion: ?Which is not a step in hypothesis testing? A. Determine or establish alpha B. Determine or establish beta C. Calulate or look up the critical value(s) D. Calculate the test statistic E. All of the above F. None of the aboveThe measurement of spread or scatter of the individual values around the central point is called: a. Measures of kurtosis b. Measures of dispersion c. mean d. Measures of skewness
- Setting the alpha value at α = .10 instead of α = .05 increases the chances of: A. making a Type I Error B. making both a Type I and Type II Error C. decreasing power D. making a Type II ErrorDo one of the following, as appropriate: (a) find the critical value of ??/2 ; (b) find the critical value of ??/2 a. 1- ? = 95%; n = 20; ?2 is unknown; population is normalFireworks and Injuries These data were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Fireworks in use x Related injuries y 67.6 12,100 87.1 12,600 117 12,500 115 10,900 118 7800 Test the hypotheses at a=0.01 critical value = ?
