Unformatted text preview: Sample Quiz 1
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) According to the empirical rule, if the data form a "bellshaped" normal distribution, percent
of the observations will be contained within 2 standard deviations around the mean.
A) 68.26 B) 95.44 C) 88.89 D) 93.75 TABLE 32
The data below represent the amount in grams of carbohydrates in a serving of breakfast cereal. 1115232919222120152517 2) Referring to Table 32. the mean carbohydrates in this sample is grams. A) 19.73 B) 23.50 C) 21.70 D) 17.87 E) 15.50
3) Referring to Table 32. the standard deviation of the carbohydrate amounts is grams (Using
mean=20).
A) 5.02 B) 252.00 C) 25.20 D) 7.20 E) 15.88
4) Referring to Table 3—2, the ﬁvenumber summary of the carbohydrate amounts condsts of
and
A) 11, 15, 20, '23. 29 B)11, 19. 22. 25, 17 C) 11, 23, 22, 25, 17 D) 11, 17, 21. 23, 29 5) Referring to Table 3—2, what type of shape does the distribution of the sample appear to have?
A) Rightskewed. B) Leftskewed. C) Symmetrical D) bellshaped TABLE 41
Mothers Against Drunk Driving is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and
driving. Four hundred accidents that occurred on a Saturday night were analyzed. Two items noted were the
number of vehicles involved and whether alcohol played a role in the accident. The numbers are shown below: Number of Vehicles
Involved
Did alcohol play a role? 1 2 3 Totals
Yes 50 100 20 170
No 25 175 30 230 Totals 75 275 50 400
————.—_._________ 6) Referring to Table 41, what proportion of accidents involved alcohol and a single vehicle? A) 25/400 131951400 0245/4“) D) 50/400
7) Referring to Table 41, what proportion of accidents involved alcohol or a single vehicle?
MRS/400 B)195/4oo (325/400 D) 50/400
8) Referring to Table 41, given theta vehicles were involved, what proportion of accidents involved
“[13:01; 30 3) 20/170 C) 20/50 D) 20/ 400 9) The probability that a new advertising campaign will increase sales is assessed as being 0.80. The
probability that the cost of developing the new ad campaign can be kept within the original budget
allocation is 0.40. Assuming that the two events are independent. the probability that the cost is kept
within budget and the campaign will increase sales is: A) 0.88 B) 0.20 C) 0.40 D) 0.32 ...
View
Full Document
 Spring '11
 ABEYSUNDARA
 Statistics

Click to edit the document details