CNSL 503: A GUIDE TO A+. QUESTIONS AND ANSWERS FORMAT.LATEST UPDATE

CNSL 503: A GUIDE TO A+. QUESTIONS AND ANSWERS
FORMAT.LATEST UPDATE
The number of freshmen entering college in a certain year is 621.
Discrete or Continuous?

Discrete

A sample of 120 employees of a company is selected and the average age is found to be 37 years.
Parameter or statistic?

statistic

The temperatures of 8 different plastic spheres.
nominal, ordinal, interval, or ratio?

interval

Find the probability.
The brand name of coffee shops has 57% recognition rate. He selects a sample of 10 residents. Find
the probability that exactly 4 out of the 10 residents recognize the brand name.

binomialpdf(10,.57,4)

= 0.140

Find the probability.
A test consists of 10 true/false questions. To pass the test, a student must answer 8 questions
correctly. If a student guesses on each question, what is the probability that the student will pass the
test?

binomialpdf(10,.5)

= .055

Express the confidence interval for -0.061<p<0.579 in the form of ^p+- E.

.579+-0.061= .518/2 = .259=^p
.579--0.061= .64/2 = .32=E

= .259+-.32

Point estimate.
Find the proportion of people who have hearing aids. If in a random sample of 493 people, 40 people
had hearing aids.

40/493

= 0.081