40 statistics questions

Grove & cipher

Exercise 29

Descriptives

Statistic Std. Error

Student_Age Mean 33.85 1.693

95% Confidence Interval for

Mean

Lower Bound 30.31

Upper Bound 37.39

5% Trimmed Mean 33.50

Median 33.50

Variance 57.292

Std. Deviation 7.569

Minimum 23

Maximum 51

Range 28

Interquartile Range 13

Skewness .386 .512

Kurtosis -.147 .992

Months_to_Completion Mean 13.35 .737

95% Confidence Interval for

Mean

Lower Bound 11.81

Upper Bound 14.89

5% Trimmed Mean 13.22

Median 13.00

Variance 10.871

Std. Deviation 3.297

Minimum 9

Maximum 20

Range 11

Interquartile Range 7

Skewness .263 .512

Kurtosis -1.016 .992

Tests of Normality

Kolmogorov-Smirnova Shapiro-Wilk

Statistic df Sig. Statistic df Sig.

Student_Age .140 20 .200* .949 20 .357

Months_to_Completion .159 20 .200* .931 20 .160

*. This is a lower bound of the true significance.

a. Lilliefors Significance Correction

Student_Age

Months_to_Completion

Regression

Variables Entered/Removeda

Model Variables Entered

Variables

Removed Method

1 Student_Ageb . Enter

a. Dependent Variable: Months_to_Completion

b. All requested variables entered.

Model Summary

Model R R Square Adjusted R Square

Std. Error of the

Estimate

1 .108a .012 -.043 3.368

a. Predictors: (Constant), Student_Age

ANOVAa

Model Sum of Squares df Mean Square F Sig.

1 Regression 2.394 1 2.394 .211 .651b

Residual 204.156 18 11.342

Total 206.550 19

a. Dependent Variable: Months_to_Completion

b. Predictors: (Constant), Student_Age

Coefficientsa

Model

Unstandardized Coefficients

Standardized

Coefficients

t Sig. B Std. Error Beta

1 (Constant) 11.763 3.536 3.326 .004

Student_Age .047 .102 .108 .459 .651

a. Dependent Variable: Months_to_Completion