67) - 67) The standard error of the mean is given by B) D STATIDS .1.1-1 Topic D
ID: 3323272 • Letter: 6
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67) - 67) The standard error of the mean is given by B) D STATIDS .1.1-1 Topic Dejoctive (8.1) Doscribe the distribution of the sample tmean: normal popalation 68) The owner of a computer repair shop has determined that their daily revenue has mean $7200 and 68) standard deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is that the mean daily revenue for the next 30 days will exceed $75007 B) 0.0869 C) 0.9147 0.0553 A) 09131 DSTATIDSS 8.1.2- Topie Objective: (8.1) Describe the dlstribution of the sample meane ronnormal popalation. 69) Professor Whata Gay surveyed a random sample of 420 statistics students. One of the questions 69) was "Will you take another mathematics class? The results showed that 252 of the students said yes. What is the sample proportion, p of students who say they will take another math class? B) 0.6 C) 0.42 0) 0775 A) 0252 D: STATISS 8.2.1-2 Topic Objactive (8.2) Describe the sampling distrlbutlon of a sample proportion 70) According to a study conducted in one dry, 38% of adults in the city have credit and debts ofmore than $2000. A simple random sample of n -100 adults is obtained froim the city. Describe the sampling distribution of p, the sample proportion of adults who have credit card debts of more than $2000. A)Exactly normal; ?"038, or"0049 B) Binomial; Hp 38, op 4.85 C) Approximately normal; ?" 0.38, ?" 0049 D) Approximately normal Hp-0.38,op- 0.0024 D STATIDSS 821-11 e: 48.2) Describe the sampling distribution oa sample proportim 71) A survey of400 non-fatal accidents showed that 173 involved faulty equipment. Find a point ) - estimate for p, the population proportion of accidents that involved faulty equipment. B) 0762 C) 0.568 D) 0.433 A) 0.302 ID: STATID5S 9.1-3 bjective:(9.3) Obtain a poins est mate for the populaston pruportion 72) A survey of 2390 musicians showed that 304 of them are left-handed. Find a point estimate for p. ) the population proportion of musicians that are left-handed B) 0.113 C)0.127 D)0.873 A) 0.146 DSTATIDES 9.11-5 Obiain a pot etiaze for the papulation propuetion. 16Explanation / Answer
67) Option-B)
68) = 7200
= 1200
n = 30
P(X bar > 7500) = P(Z > (7500 - 7200)/(1200/sqrt(30)))
= P(Z > 1.37)
= 1 - P(Z < 1.37)
= 1 - 0.9147
= 0.0853
Option-D) 0.0853
69) p = 252 / 420 = 0.6
Option-B) 0.6
70) p = 0.38
p = sqrt(0.38 * 0.62 / 100) = 0.049
Option-C)
71) point estimate = 173 / 400 = 0.433
Option-D) 0.433
72) p = 304 / 2393 = 0.127
Option-C) 0.127
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