Midterm Statistics

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Mid-Exam for Statistics 2 for IBA
12 March 2013; duration: two hours
It is NOT allowed to use a graphical, programmable calculator; only a simple pocket calculator is allowed. Write the answers to the questions on the attached answering form (on pages 7 and 8); only the answers, no derivations. (For this midterm, only the final answers to each individual question count.)
This mid-exam contains 8 pages: 4 pages with information and three exercises, 1 page with a few formulae and 2 pages for filling in your answers (and 1 empty page).
Only hand in the two-sided answering form! Do not forget to fill in: your name,
ANR and study.
Below you may need the following results of the N(0, 1)-distribution, t-distributions,
 2 -distributions, and F-distributions: z0.10 = 1.2816; z0.09 = 1.3408; z0.0725 = 1.4574; z0.07 = 1.4758; z0.03 = 1.8808; z0.025 = 1.9600; z0.005 = 2.5758

z0.08 = 1.4051; z0.06 = 1.5548; z0.02 = 2.0537;

z0.0775 = 1.4221; z0.0750 = 1.4395; z0.05 = 1.6449; z0.04 = 1.7507; z0.015 = 2.1701; z0.01 = 2.3263;

 = 47 degrees of freedom
 = 96 df
124 df
125 df
248 df
249 df
335 df
336 df

t0.1 = 1.2998; t0.1 = 1.2904; t0.1 = 1.2884; t0.1 = 1.2883; t0.1 = 1.2850; t0.1 = 1.2849; t0.1 = 1.2841; t0.1 = 1.2840;

t0.05 = 1.6779; t0.05 = 1.6609; t0.05 = 1.6572; t0.05 = 1.6571; t0.05 = 1.6510; t0.05 = 1.6510; t0.05 = 1.6494; t0.05 = 1.6494;

124 df

 02.1

= 104.295;

 02.9

t0.025 = 2.0117 t0.025 = 1.9850 t0.025 = 1.9793 t0.025 = 1.9791 t0.025 = 1.9696 t0.025 = 1.9695 t0.025 = 1.9671 t0.025 = 1.9670
= 144.561;

= 99.283;

 02.025 = 95.070;

= 150.989;

 02.975 = 156.714;

2
 0 .1

= 105.213;

2
 0 .9

= 145.643;

= 100.178;



= 152.094;

2
0.05

125 df



2
0.05

 02.025 = 95.946;

2
0.95

2
0.95

 02.975 = 157.839;

124 and 124 df

125 and 125 df

Always take the closest value!
1

Exercise 1
Given that university students can

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