Bus 224 Chapter 10 Questioins.xlsx

# Bus 224 Chapter 10 Questioins.xlsx - Descriptive statistics...

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Descriptive statistics # 1 count 5 mean 17.00 sample standard deviation 3.54 sample variance 12.50 minimum 12 maximum 21 range 9 standard error of the mean 1.58 skewness -0.57 kurtosis -0.69 coefficient of variation (CV) 20.80%

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15) 18 15 12 19 21 A: Using the table of t-distribution with 5-1 =4 degresses of freedom for the probabilty 0.01 of a one tail test:t Null hyothesis will be rejeced if the value of the test is less than B: On tab Q15 stat: mean 17 and Sample Standard Deviation 3.54 Plug in play -1.895 C: Since -1/895>-3.747 The null hypothesis is not rejected. There is no evidence that the population mean is less than 20 D: Software give the p-value is between 0.05 and 0.01 0.065 H(sub0):μ≥ 20 H(sub1):μ≤20 t=17-20/(3.54/√5)=
the value of t is 3.747 n -3.747( as for less than) 4

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Descriptive statistics Messages count 12 mean 82.50 sample standard deviation 59.49 sample variance 3,539.36 minimum 21 maximum 203 range 182 population variance 3,244.42 population standard deviation 56.96 confidence interval 95.% lower 48.84 confidence interval 95.% upper 116.16 margin of error 33.66 z 1.96 confidence interval 95.% lower 44.70 confidence interval 95.% upper
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