Ans 1 -1) we will use chi-square test for independence
2) Z test for a single mean
3) T-test for comparing means
4) Chi-square test for goodness of fit
Ans 2 ) using minitab> stat>tables >Chi square
we have
Chi-Square Goodness-of-Fit Test for Observed Counts in Variable: Observe count
Using category names in class
Test Contribution
Category Observed Proportion Expected to Chi-Sq
Freshmen 143 0.30 138 0.181159
Sophomore 109 0.25 115 0.313043
Junior 112 0.25 115 0.078261
Senior 96 0.20 92 0.173913
N DF Chi-Sq P-Value
460 3 0.746377 0.862
class | Observe count | Expected count |
Freshmen | 143 | 138 |
Sophomore | 109 | 115 |
Junior | 112 | 115 |
Senior | 96 | 92 |
the value of chi square is 0.746
p value is 0.862
option A is true
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