Question 1129679: 1) A bank asks customers to evaluate the drive-thru service as good, average, or poor. Which level of measurement is this classification?
(a) nominal level. (b) ordinal level. (c) interval level. (d) ratio level.
2) If Gallup, Harris, and other pollsters asked people to indicate their political party affiliation as PUP, UDP, or Independent, the data gathered would be an example of which scale of measurement?
(a) nominal level. (b) ordinal level. (c) interval level. (d) ratio level.
3) The color of ink in a pen is what type of data?
(a) continuous variable. (b) discrete variable. (c) qualitative (d) quantitative
4) Which of the following is not a measure of dispersion?
(a) Variance (b) Quartiles (c) Mean (d) Standard deviation
5) A die with 6 sides is rolled. What is the probability of rolling a number less than 5?
(a) 4 (b) 2/3 (c) 5/6 (d)1\6
6) From the following Box-and-Whisker what is the value of Q1?
30 45 70 85
(a) 25 (b) 30 (c) 45 (d) 70
7) When every member of the accessible population has an equal chance of being selected to participate in the study, the researcher is using
(a) simple random sampling. (c) stratified random sampling.
(b)cluster sampling. (d) systematic sampling
8) Find the z-score corresponding to the given value and use the z-score to determine whether the value is unusual. A test score of 53.8 on a test having a mean of 73 and a standard deviation of 12.
(a) -1.6; unusual (b) -19.2; unusual (c) -1.6; not unusual (d) 1.6; not unusual
9) Use the empirical rule to solve the problem.
The amount of Jen's monthly phone bill is normally distributed with a mean of $69 and a standard deviation of $9. What percentage of her phone bills are between $42 and $96?
(a) 99.7% (b) 68% (c) 95% (d) 99.99%
10) Six college buddies bought each other Christmas gifts. They spent:
$293.22, $172.63, $219.24, $285.41, $277.38, $172.85
What was the mean amount spent? Round your answer to the nearest cent.
(a) $272.15 (b) $284.15 (c) $236.79 (d) $355.18
11) The distances traveled (in miles) to 7 different swim meets are given below:
22, 26, 34, 44, 73, 74, 80 Find the median distance traveled.
(a) 73 miles (b) 34 miles (c) 50 miles (d) 44 miles
12) Which color sweater is the modal color?
(a) Pink (b) Purple (c) Orange (d) White
13) Find the original data from the stem-and-leaf plot below.
Stem Leaves
3 5 8
4 1 8
5 5 5
(a) 35, 31, 38, 41, 51, 55 (b) 35, 38, 41, 48, 55, 55
(c) 35, 38, 41, 41, 55, 55 (d) 31, 35, 31, 48, 58, 55
14) If a researcher selected five schools at random and then interviewed each of the teachers in those five schools, the researcher used
(a) simple random sampling. (c) stratified random sampling.
(b) cluster sampling. (d) systematic sampling.
15) Two fair dices are tossed. What is the probability space for the event?
(a) 4 (b) 6 (c) 36 (d) 2
16) Harry drew one card from a deck of cards. What is the probability that he drew a heart or spades?
(a) 3/13 (b) 1/2 (c) 1/13 (d) 4/13
17) The value of 5! is
(a) 120 (b) 3.63 x 106 (c) 3.63 (d) 3.99 x 106
18) A bag contains 4 red balls and 6 blue balls. What is the probability of selecting a blue ball? (a) 3/10 (b) 1/2 (c) 3/5 (d) 4/13
19) Which of the following is NOT a Discrete Probability Distribution?
(a) Binomial Distribution (c) Poisson Distribution
(b) Normal Distribution (d) Hyper-geometric Distribution
20) What is 15C4 - 10C4?
(a) 280888 (b) 27720 (c) 1155 (d) 20880
SECTION II
The following data set represents the ages of patients visiting the Belmopan outdoor clinic during a particular week
36 25 38 46 55 68 72 55 36 38
67 45 22 48 91 46 52 61 58 55
a) Represent the data on a stem and leaf display.
b) Represent the data on a dot plot.
c) Construct a frequency distribution chart using eight classes. After constructing your frequency distribution (Start you lowest class interval with the smallest value)
d) Construct a histogram to represent the information.
2) Calculate the covariance and correlation of the following data set.
x 10 15 25
y 12 16 20
3) The accompanying Venn diagram illustrates a sample space containing six sample points and three events, A, B, and C. The probabilities of the sample points are P(1) = 0.3, P(2) = 0.2, P(3) = 0.1, P(4) = 0.1, P(5) = 0.1 and P(6) = 0.2.
Find:
a)
b)
c)
d)
e) Are A and B mutually exclusive? Why?
4) A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 8.
a) What is the probability of getting a grade below 91 on this exam?
b) What is the percentage that a student scored between 65 and 89?
c) If a student scores 57, what percentage of the class scored higher than the student?
d) What grade must a student receive to be in the 90th percentile? P(x < x0) = 0.90
5) In San Francisco, 30% of workers take public transportation daily (USA Today, December 21, 2005).
a) In a sample of 10 workers, what is the probability that exactly three workers take public transportation daily?
b) In a sample of 10 workers, what is the probability that at least three workers take public transportation daily?
6) During the period of time that a local university takes phone-in registrations, calls come in
at the rate of one every two minutes.
a) What is the expected number of calls in one hour?
b) What is the probability of three calls in five minutes?
c) What is the probability of no calls in a five-minute period?
7) The probability distribution for the random variable X is as follow;
x f(x)
10 0.45
30 0.35
50 0.20
a) Is this probability distribution valid? Explain.
b) Find E[X] (expectation of X)
c) Var[X] (variance of X)
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! 1 is b
2 is a
3 is c
4 is c
5 is b
7 is a
8 is c z=(x-mean)/sd
9 is 3 sd a
10 add the numbers and divide by 4
11 is 44, the middle number of 7 that are ordered
13 is b, the first number is the tens.
14 and 15 are c (die is singular of dice)
16 is 1/2 (4 suits)
17 5! is 5*4*3*2*1=120
18 c
19 b
20 is 1155
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