Rev test I 2122

Rev test I 2122 - Review for test I 1. While eating in FIU...

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1. While eating in FIU cafeteria, 200 students are asked to perform a taste test in which they drink from two unmarked cups. They are then asked which drink they prefer. Identify the variable of interest, the data collection method, type of the data, and population of interest to the cafeteria administration. 2. Standard deck of card contains 52 cards. Find the probability of : a) Selecting a spade card b) Getting a king or a jack c) Choosing a red card or a queen d) If 3 cards are selected without replacement find the probability all three are aces? e) If 3 cards are selected without replacement find the probability of at least one diamond card? 3. Given a sample: 33, 24, 21, 14, 24. Calculate the variance, S.D., mean, median, mode, range. 4. For each variable described, indicate whether it is nominal, ordinal, discrete or continuous. ____ 1) the number of errors in a one-page letter ___ 2) the brand of jeans preferred by a student ___ 3) the educational level of a child’s mother ___4) the weight of the meat in a chef’s salad 5. A hair salon did a survey of 360 customers regarding satisfaction with service and type of customer. A walk-in customer is one who has seen no ads and not been referred. The other customers either saw a TV ad or were referred to the salon (but not both). The results follow Walk In TV Ad Referred Total Not Satisfied 21 9 5 35 Neutral 18 25 37 80 Satisfied 36 43 59 138 Very Satisfied 28 31 48 107 Total 103 108 149 360 Find the probability that a customer is: a ) Not satisfied b) Very satisfied, given referred c) At least satisfied and TV Ad d) Are the events (A) satisfied and (B) referred independent or not? Prove your answer. 6. Suppose the average height and S.D. of 50 students in a class are 66 inch and 3 inch respectively. a) If nothing is known about the shape of the distribution, what proportion represents the number of students outside the interval from 60 to 72 inch? b) If the heights have a mound shaped and symmetric histogram, what
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Rev test I 2122 - Review for test I 1. While eating in FIU...

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