question 1:
From the given data, the following statistics are calculated:
n = 19
= 89.8421
s = 23.9148
= 0.05
ndf = 19 - 1 = 18
Confidence interval:
Low End:
From Table:
Low End:
High End:
From Table:
High End:
Confidence Interval:
8. Assume that the distribution of the sample in Problem 1 s N(μ, σ2). Find a 95% CI for σ2 1. ...
1. The test scores in a class are 67, 83, 71, 103, 76, 95, 20, 96, 124, 79, 98, 115, 108, 113, 86, 113, 106, 83, 71, 80, 102. 85, 94. Give a 95% CI for the first quintile.
1. For each set below, using Excel, construct a. a frequency distribution, b. a relative frequency distribution, and c. a cumulative relative frequency distribution. Consider whether or not you should group your data. Describe how you determined your bin width, if you grouped the data in intervals. Set 1 75 95 103 100 93 91 90 92 89 105 86 85 81 96 103 99 94 95 91 97 92 107...
Using simple regression, determine whether test scores are significantly related to sales performance. Use significance level of 0.05%. Clearly interpret the slope (beta coefficient) and the adjusted R squared value you obtained. Using multiple regression, determine whether test scores and number of months are significantly related to sales performance. Use significance level of 0.05%. Clearly interpret the slopes (beta coefficients) and the adjusted R squared value you obtained. E ៥ដង А B c D 1 DATA SET FOR SALESFORCE PROBLEM...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
The following are the IQ scores of 60 students from a university. The histogram of the data is symmetric. 79 79 81 82 82 84 84 84 85 85 86 86 87 89 89 89 90 90 90 91 91 92 92 93 94 95 95 96 98 99 99 102 102 102 103 104 104 104 105 106 106 106 108 109 109 110 111 111 113 113 113 115 117 117 120 121 123 124 125 130 a....
USE R AND SHOW CODES!! The IQ was measured for 35 twins. Is there any difference in IQ between twins? DATA Twin 1 Twin 2 113 109 94 100 99 86 77 80 81 95 91 106 111 117 104 107 85 85 66 84 111 125 51 66 109 108 122 121 97 98 82 94 100 88 100 104 93 84 99 95 109 98 95 100 75 86 104 103 73 78 88 99 92 111 108...
. Let Yi, ,Ý, be a sample from N(μ, σ2) distribution, where both μ and σ2 are un known Repeat the argument that was given in class to show that is a pivot (start by representing Yj as a linear function of a N(0, 1) random variable). Use the fact that (n-pe, of freedom") to construct the confidence interval with coverage probability 95% for σ2 (you can state the answer in terms of quantiles of X2-distribution, or find their numerical...
1. Forecast demand for Year 4. a. Explain what technique you utilized to forecast your demand. b. Explain why you chose this technique over others. Year 3 Year 1 Year 2 Actual Actual Actual Forecast Forecast Forecast Demand Demand Demand Week 1 52 57 63 55 66 77 Week 2 49 58 68 69 75 65 Week 3 47 50 58 65 80 74 Week 4 60 53 58 55 78 67 57 Week 5 49 57 64 76 77...
Midterm1 = (83.33, 98.33, 75, 91.67, 96.67, 95, 86.67, 65, 100, 100, 80, 88.33, 96.67, 96.67, 90, 96.67, 86.67, 93.33, 80, 91.67, 98.33, 86.67, 85, 86.67, 95, 83.33, 96.67, 81.67, 98.33, 100, 95, 93.33, 91.67, 88.33, 98.33, 93.33, 98.33, 93.33, 85, 88.33, 100, 98.33, 96.67, 90, 86.67, 100, 96.67, 98.33, 90, 96.67, 86.67, 95, 78.33, 86.67, 100, 81.67, 96.67, 91.67, 96.67, 96.67, 95, 96.67, 73.33, 100, 93.33, 96.67, 88.33, 70, 96.67, 96.67, 100, 88.33, 96.67, 100, 88.33, 100, 78.33, 93.33,...