From a group of six people, two individuals are to be selected at random. How many
possible selections are there?
12
36
15
8
An experiment consists of selecting a student association president and vice president.
All undergraduate students (freshmen through seniors) are eligible for these positions.
How many sample points (possible outcomes as to the classifications) exist?
The number of all undergraduate students in the university
16
8
32
Forty percent of all registered voters in a national election are female. A random sample
of 5 voters is selected. The probability that the sample contains 2 female voters is
0.0778
0.7780
0.5000
0.3456
A normal probability distribution
is a continuous probability distribution
is a discrete probability distribution
can be either continuous or discrete
must have a standard deviation of 1
The starting salaries of individuals with a master degree are normally distributed with a
mean of $30,000 and a standard deviation of $5,000. What is the probability that a randomly
selected individual with a master degree will get a starting salary of at least $20,000?
0.4772
0.9772
0.0228
0.9544
Random samples of size 49 are taken from a population that has 200 elements, a mean
of 180, and a variance of 196. The distribution of the population is unknown. The mean
and the standard error of the mean are
180 and 24.39
180 and 28
180 and 2
180 and 1.74
From a population that is not normally distributed and whose standard deviation is not
known, a sample of 20 items is selected to develop an interval estimate for μ
The normal distribution can be used.
The t distribution with 19 degrees of freedom must be used.
The t distribution with 20 degrees of freedom must be used.
The sample size must be increased.
An ANOVA procedure is applied to data obtained from 6 samples where each sample
contains 20 observations. The degrees of freedom for he critical value of F are
6 numerator and 20 denominator degrees of freedom
5 numerator and 20 denominator degrees of freedom
5 numerator and 114 denominator degrees of freedom
6 numerator and 114 denominator degrees of freedom
only large sample sizes
only small sample sizes
any sample size
only samples of size thirty or greater
A producer of lightbulbs wants to estimate proportion of defective lightbulbs within
±0.1 with a 95% degree of confidence. What is the minimum sample size required if previous
experience indicates that the proportion of defective lightbulbns produced is 0.2. (8%)
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