Question

The grade point average of 4 randomly selected college students is recorded at the end of the fall and spring semesters of their senior year, as follows:

Student | 1 | 2 | 3 | 4 |

Fall | 2.5 | 1.8 | 2.2 | 3.3 |

Spring | 1.6 | 2.5 | 2.5 | 2.8 |

Round your answers to three decimal places.

(a). The mean difference in GPA (Spring - Fall) is:

(b). The standard deviation of the difference in GPA (Spring - Fall) is:

(c). Using your answers from above, construct a 95% confidence interval for the mean difference in GPA (Spring - Fall):

Lower bound = and Upper bound =

Answer #2

The statistical software output for this problem is:

Hence,

a) Mean difference = -**0.1**

b) Standard deviation = **0.730**

c) Lower bound = -**1.262**

Upper bound = **1.062**

answered by: anonymous

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