MATH_221_SAMPLE_MODULE_7_UPDATED_SU_10(2)

MATH_221_SAMPLE_MODULE_7_UPDATED_SU_10(2) - A....

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Week 7 Module Questions A. Setting up hypotheses  Exercise 1 My Known Values x = 42,000 n = 35 people s= 7548 x_bar = 39,367 ( sample mean )  = 0.05 or a 95% confidence interval α My Unknown Values 0  : value to be tested inequalities    constraint Construct a z value  Z = (x - x_bar) / s = (42000 – 39367)/ (7548 /   ( 35 )) = 0.0589237295 Or 0.06 My Equation / My Formulation

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0  :  μ  = \$42,000 ( null hypothesis ) 1  :  μ    \$42,000 ( alternative hypothesis ) My Interpretation The null hypothesis is the statement that is to be tested. A. Setting up hypotheses  Exercise 2
My Known Values x = 2500 n = 40 people s= 750 x_bar = -3200 ( sample mean )  = 0.05 or a 95% confidence interval α My Unknown Values 0  : value to be tested inequalities    constraint Construct a z value    My Equation / My Formulation 0  :  μ  >= -\$2500 ( null hypothesis ) 1  :  μ  < -\$2500 ( alternative hypothesis ) Or 0  :  μ  <= \$2500 ( null hypothesis ) 1  :  μ  > \$2500 ( alternative hypothesis )

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My Interpretation The null hypothesis is the statement that is to be tested.
B. Tests about a Population Mean  Exercise 1

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