Ch. 9 Review

Name: __________________ Per: ____________________

Directions: SHOW YOUR WORK. Include the items discussed in class (such as original claim, the null hypothesis, the alternative hypothesis, draws a graph (shade the graph where the TS can be found), calculate test statistic, critical values, etc. and write a conclusive statement regarding the claim (round to 3 decimals for t and Z, and 3 sig/fig for prob/proportion). Identify whether H 0 or H1 is the claim by writing claim next to the correct box. 1. Use a the following data and a .01 significance level to test the claim that the Poway’s varsity baseball team has a higher average of hits per game than TP. Use the following data from each teams last 10 games. (2 sample T test)/(2 Sample T Interval) Torrey Kndy Grm Slv LCC MC MC MC RB RB RB Pines 8 8 10 9 10 15 10 4 9 3 Poway LCC 11

Oty R 12

Edn

GrVy

WV

WV

WV

MC

MC

MC

6

12

15

12

10

15

19

15

Graph:

H0 :

H1 :

n1 

n2 

df1 

df 2 

X1 

X2 

s1 

s2 

CV :

TS : α= <

<

2. Use the data from question 1 and a .01 significance level to test the claim that Poway has the same proportion of games with less than 8 hits than TP. (2 Prop Z Test)/(2 Prop Z interval) Graph: H0 : H1 :

x1 

x2 

n1 

n2 

^

p1  CV : p  value =

^

p2  TS : α=

<

<

3. Use the data from question 1 and a .05 significance level to test the claim that the Poway varies more than the TP. Use Table A-5 to find CV (2 Sample F Test) Graph:

H0 :

H1 :

n1 

n2 

df1 

df 2 

X1 

X2 

s1 

s2 

CV :

TS : α=

4. Use the following data and a .05 significance level to test the claim That Coach Smith’s weight gain plan is effective at helping athletes gain weight after being on it for 3 months. Weights measured in pounds. (T test on the difference) Before 115 145 162 171 138

After 125 150 173 185 136

173 190

180 206

Graph:

Difference

H0 : n = CV :

H1 : df = TS : α= d sd 

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