TECH SPOT: SAMPLE CRE QUESTIONS (PART 5)

Share This Post

Answers to CRE questions in March 2019 Newsletter

1. X and Y are discrete random variables. The probability that X = 3 is 0.20 and the probability that Y = 4 is 0.30. The probability of observing that X = 3 and Y = 4 concurrently is closest to:
a. 0.06
b. 0.
c. 0.50
d. Cannot answer with the information provided.

2. The probabilities that three students will earn an A on an exam are 0.20, 0.25, and 0.30, respectively. If each student’s performance is independent of that of the other two students, the probability that all three students will earn an A is closest to:
a. 0.0150
b. 0.0075
c. 0.0010
d. 0.7500

3. The following table summarizes the availability of trucks with air bags and bucket seats at a dealership.
What is the probability of randomly selecting a truck with air bags and bucket seats?

a. 0.34
b. 0.57
c. 0.28
d. 0.16

4. The lower limit of a normal distribution is:
a. negative one
b. zero
c. one
d. negative infinity

5. Approximately 50 percent of all observations for a normally distributed random variable fall in the interval:
a. μ ± 2σ
b. μ ± 0.67σ
c. μ ± σ
d. μ ± 3σ

6. A depot receives an average of two engines per day to repair. The probability that they will receive 20 engines in 8 days is:
a. 3.66%
b. 16.56%
c. 6.40%
d. 5.59%

7. The approximate 99% confidence interval for the population mean based on a sample of 60 returns with a mean of 7% and a sample standard deviation of 25% is closest to:
a. 1.546% to 13.454%
b. 0.546% to 13.454%
c. -1.59% to 15.589%
d. 1.584% to 14.584%

8. What is the computed value of the test statistic that follows an F-distribution when sample variances are equal and the level of significance is 0.10?
a. 0.90
b. 0.05
c. 1.00
d. 0.10

9 A survey is taken to determine whether the average starting salaries of Reliability engineers is equal to or greater than $59,000 per year. What is the test statistic given a sample of 135 new Reliability engineers with a mean starting salary of $64,000 and a standard deviation of $5,500?
a. -0.91
b. -10.56
c. 10.56
d. 0.91

10. You have collected monthly returns to depot and want to test the null hypothesis that the standard deviation exceeds the advertised standard deviation of 3.5%. The most appropriate test statistic is based on
a. chi-square test
b. t-test
c. F-test
d. z-test

Picture © B. Poncelet https://bennyponcelet.wordpress.com

More To Explore

General

QMD presents: 2023 Fall Conference on “Improving Measurement Confidence and Reducing Risk”

Measurement Quality Division’s Fall Conference – Improving Measurement Confidence and Reducing Risk Starts:  Nov 11, 2023 09:00 AM (ET)Ends:  Nov 13, 2023 09:00 AM (ET)Associated with  Denver Section  Sponsored by the ASQ Measurement Quality Division and Akron-Canton SectionNetwork with your peers, practitioners, and subject matter experts! Conference Topics (Oct 12 – 13)• Developing Measurement Assurance Programs• Optimizing Your

General

RU’s when watching recorded videos system maintenance

RU’s When Watching Recorded Videos System Maintenance   Due to a bug we need to perform maintenance the RU for watching recorded webinar system.  RU’s might not be send for the moment.  Please be patience we will post ones we are up and running again.  

Scroll to Top