What is the level of data corresponding to a military rank (Lieutenant, Captain, Major)?
ordinal
Sue Taylor, Director of Global Industrial Sales, is concerned by a deteriorating sales trend. Specifically, the number of customers is stable at 1,500, but they are purchasing less each year. She orders her staff to search for causes of the downward trend
ratio level
Sue Taylor, Director of Global Industrial Sales, is concerned by a deteriorating sales trend. Specifically, the number of industrial customers is stable at 1,500, but they are purchasing less each year. She orders her staff to search for causes of the dow
the population
Miguel Hernandez , Senior Vice President of Human Resources at Memorial Hospital, is exploring the usage of nursing over-time hours in the emergency department during the last operating year (January 1, 2012 through December 31, 2012). Miguel intends to s
the population
Relative frequency for an individual class is the __________.
individual class frequency divided by the total frequency
Cumulative frequency for an individual class is the __________.
individual class frequency plus the total frequency of all preceding classes
Abel Alonzo, Director of Human Resources, is exploring employee absenteeism at the Harrison Haulers Plant during the last operating year. A review of all personnel records indicated that absences ranged from zero to twenty-nine days per employee. The foll
Some numbers between 0 and 29, inclusively, would not fall into any interval.
The following class intervals for a frequency distribution were developed to provide information regarding the starting salaries for students graduating from a particular school:
Salary
Number of Graduates
($1,000s)
28-under 31
-
31-under 35
-
34-under 37
The second and the third interval overlap.
Which of the following is an inadmissible value for the probability of an uncertain outcome?
1.50
Which of the following is not a legitimate probability value?
5/4
If the occurrence or non occurrence of one event does not affect the occurrence or non occurrence of another event, the two events are ________________________.
independent
If two events, Event A with probability P(A) and Event B with probability P(B) are independent, then __________.
P(A ? B) = P(A) x P(B)
If E and F are mutually exclusive, then _______.
the probability of the intersection is zero
In any statistical experiment if the occurrence of one event precludes the occurrence of the other events, the events of the experiment are called __________.
mutually exclusive events
Given P (A) = 0.45, P (B) = 0.30, P (A?B) = 0.05. Find P (A|B).
0.167
Given P (A) = 0.45, P (B) = 0.30, P (A?B) = 0.05. Find P (B|A).
0.111
If X = {1, 2, 4, 8, 9, 10, 16} and Y = {3, 4, 7, 9, 15}, then X ? Y is ________.
{4, 9}
Consider the following sample space, S, and several events defined on it. S = {Albert, Betty, Abel, Jack, Patty, Meagan}, and the events are: F = {Betty, Patty, Meagan}, H = {Abel, Meagan}, and P = {Betty, Abel}. F?H is ___________.
{Betty, Abel, Patty, Meagan}
The average time of students spend on reading per day is __________.
a continuous random variable
The volume of liquid in an unopened 1-gallon can of paint is an example of _________.
a continuous random variable
What is the variance of a binomial distribution in which the number of trials n = 100 and the probability of success p = 0.5?
25
A large industrial firm allows a discount on any invoice that is paid within 30 days. Of all invoices, 10% receive the discount. In a company audit, 15 invoices are sampled at random. The mean (average) value of the number of the 15 sampled invoices that
1.5
If x is a binomial random variable with n = 10 and p = 0.8, the standard deviation of x is _________.
1.26
If x, the time (in minutes) to complete an change job at certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 ? x ? 30), then the probability that an oil change job is completed in less than 17 minutes, i.e.,
0.0000
If x, the time (in minutes) to complete an change job at certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 ? x ? 30), then the probability that an oil change job is completed in 25 to 28 minutes, inclusivel
0.300
The values of a random variable are uniformly distributed between 20 and 70. The mean of this distribution is __________.
45
If the number of parking spots at urban grocery stores is uniformly distributed over the interval 90 to 140, inclusively (90 ? x ? 140), then the mean of this distribution is __________________.
115
If x, the time (in minutes) to complete an oil change job at certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 ? x ? 30), then the standard deviation of this distribution is __________________.
2.89
The values of a random variable are uniformly distributed between 20 and 70. The standard deviation of this distribution is __________.
14.43
The average salary of a travel management professional is $98,500. Assume that the standard deviation of such salaries is $40,000. A random sample of 100 travel management professionals are selected, then the mean and standard deviation of the sampling me
98500 and 4000
Public-opinion polls are conducted by a survey company to estimate the fraction of U.S. citizens who trust the president. Suppose 2000 people are randomly chosen and 1587 answer that they trust the president. What is the point estimate of the population p
0.7935, 0.81 and 0.0088
If reasonably large sized samples (i.e., samples of 30 elements or more) are drawn from a binomial distribution, the sample means will be approximately __________.
normally distributed
If reasonably large sized samples (i.e., samples of 30 elements or more) are drawn from a Poisson distribution, the sample means will be approximately __________.
normally distributed
Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package. She randomly selects a sample of 200 households. Forty households prefer the new package to all other package designs. The point estimate for th
0.20
A researcher wants to estimate the proportion of the population which possesses a given characteristic. A random sample of size 800 is taken resulting in 360 items which possess the characteristic. The point estimate for this population proportion is ____
0.45
A researcher is interested in estimating the mean weight of a semi tracker truck to determine the potential load capacity. She takes a random sample of 17 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500. The 90%
19,365 to 20,635
In estimating the sample size necessary to estimate p, if there is no good approximation for the value of p available, the value of ____ should be used as an estimate of p in the formula.
0.50
Consider the following null and alternative hypotheses.
Ho: ? ? 67
Ha: ? < 67
These hypotheses _______________.
indicate a one-tailed test with a rejection area in the left tail
Consider the following null and alternative hypotheses.
Ho: ? ?67
Ha: ? > 67
These hypotheses _______________.
indicate a one-tailed test with a rejection area in the right tail
The weight of a USB flash drive is 30 grams and is normally distributed. Periodically, quality control inspectors at Dallas Flash Drives randomly select a sample of 17 USB flash drives. If the mean weight of the USB flash drives is too heavy or too light
? = 30
A Type II error is committed when __________.
the null hypothesis is false and it is not rejected
A Type I error is committed when __________.
the null hypothesis is true and it is rejected