AT&T would like to investigate if brand of smartphone and income level are independent variables. The following contingency table shows the number of customers who own three brands of smartphones along with their income level
SmartphoneIncome Level iPhone Samsung MotorolaLess than $50,000 15 20 15$50,000-$100,000 15 50 25More than $100,000 10 20 30The expected number of customers who own an iPhone and earn more than $100,000 is ________.A) 10.0
B) 12.0
C) 17.5
D) 22.5
B
Business
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A) emancipation B) restraint of contract C) contract of adhesion D) quasi-contract
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Almost all of the data from a normal distribution fall within ________ standard deviations of the mean
Fill in the blank with correct word.
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