D. Chi-squared A. 1 sample z test E. 1 proportion z test B. 1 sample t test F. 2
ID: 3020628 • Letter: D
Question
D. Chi-squared A. 1 sample z test E. 1 proportion z test B. 1 sample t test F. 2 proportion z test C. 2 sample t test G. matched - pairs t test 1. Consumer Reports (January 1993) stated that the mean retail cost of an AT&T; model 3730 cellular phone was $600. A random sample of 10 stores in Los Angeles had a mean cost of $586.50 with standard deviation of $26.77. Does this indicate that the mean cost in Los Angeles is less than $600? 2. Athabssca Fishing Lodge is located on Lake Athabasca in northerm Canada. In one of their recent brochures, the lodge advertises that 75% of their guests catch northern pike over 20 pounds. Suppose last summer 64 out of a random sample of 83 guests did in fact catch northern pikes weighing over 20 pounds. Does this indicate that the population proportion of guests who catch pikes over 20 pounds is different from 75%? 3. A new law has been passed giving city police greater powers in apprehending suspected criminals. For six neighborhoods, the numbers of reported crimes one year before and one year after the new law are shown. Does this indicate that the number of reported crimes have dropped? Nelghborbood 1 2 3 4 5 6 Before After 18 35 44 28 22 37 21 23 30 19 24 29 4. A machine has a record of producing 80% excellent, 16% good, and 4% unoceptable parts. After eaxtensive repairs, a sample of 200 produced 157 excelent, 42 good, and 1 unacceptable part. Have the repairs changed the nature of the out put of the machine? 5. A random sample of 378 hotel guests was takem one year ago, and it was found that 178 requested a random sample of 516 hotel guests showed that 320 requested nonsmoking esting nonsmoking rooms has nonstnoking evens. Recently, roons. Do these data indicate that the proportion of hotel guests roquesting nonsmoking rooms 16 3 0Explanation / Answer
3) NEIGHBOURHOOD
1 18 21
2 35 23
3 44 30
4 28 19
5 22 24
6 37 29
AVERAGE CRIMES BEFORE = 184/6 = 30.6
AVERAGE CRIME AFTER = 146/6 = 24.3
AS THE AVERAGE CRIMES HAS BEEN REDUCED THIS SHOWS THE REDUCTION IN CRIMES BUT THE CRIMES IN SOME NEIGHBOURHOOD HAS INCREASED FROM LAST YEAR
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.