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MTH220_JAN21_L01QuizzesPCQ01

 


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PCQ01

  • Due 17 Mar at 23:55
    •  
  • Points 100
    •  
  • Questions 10
    •  
  • Available 15 Feb at 0:00 - 17 Mar at 23:55 about 1 month
    •  
  • Time limit None
    •  
  • Allowed attempts 3

Instructions

Deadline is on 17 March 2021, 2355 hours.

Take the quiz again

Attempt history

AttemptTimeScore
KEPTAttempt 24 minutes100 out of 100
LATESTAttempt 24 minutes100 out of 100
Attempt 157 minutes90 out of 100
 Correct answers are hidden.
Score for this attempt: 100 out of 100
Submitted 17 Mar at 21:06
This attempt took 4 minutes.
 
Question 1
10 / 10 pts

Samples of size n = 9 are selected from a population with mean µ = 60 and standard deviation σ = 12. What is the expected value for the distribution of sample means?


  
  
  
  
 
Question 2
10 / 10 pts

Samples of size n = 9 are selected from a population with mean µ = 60 and standard deviation σ = 12. What is the standard deviation for the distribution of sample means?


  
  
  
  
 
Question 3
10 / 10 pts

The mean rent of an apartment is $780.  You randomly select 9 apartments.  Compute the probability that the mean rent is less than $825.  Assume that the rents are normally distributed with a mean of $780 and a standard deviation of $150. 


  
  
  
  
 
Question 4
10 / 10 pts

A bank found that 24% of it’s loans become delinquent. Suppose 200 loans are made. Using normal approximation to binomial model, compute the approximate probability that at least 60 loans are delinquent.


  
  
  
  
 
Question 5
10 / 10 pts

Given that the distribution of PaO2 levels among newborns follows a normal distribution with mean = 38 and a standard deviation = 9. Suppose we take a sample of size n = 25. Compute the probability that the sample average will be greater than 36.


  
  
  
  
 
Question 6
10 / 10 pts
Which of the following most closely resembles the general form of an interval estimate?
  
  
  
  
 
Question 7
10 / 10 pts
The purpose of a confidence interval is to ______________.
  
  
  
  
 
Question 8
10 / 10 pts

A random sample of n = 16 has sample mean = 40 and sample variance = 36.  Construct a 95% confidence interval (i.e. t interval) for μ.


  
  
  
  
 
Question 9
10 / 10 pts

A random sample of 9 power supply was drawn from a normal population.  The mean voltage is found to be 5.3 volts. From past historical testing, the population standard deviation is known to be 0.4.  Construct a 90% confidence interval for the population mean voltage.


  
  
  
  
 
Question 10
10 / 10 pts

Which of the following statements is true?


  
  
  
  
Quiz score: 100 out of 100

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