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2021_JAN_T2_PT_6

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PCQ01

Started: 17 Mar at 20:04

Quiz instructions

Deadline is on 17 March 2021, 2355 hours.

 

Flag question: Question 1

Question 110 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?

Group of answer choices

60

20

12

4

 

Flag question: Question 2

Question 210 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?

Group of answer choices

4

20

12

60

 

Flag question: Question 3

Question 310 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. 

Group of answer choices

0.816

0.732

0.658

0.451

 

Flag question: Question 4

Question 410 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.

Group of answer choices

0.029

0.016

0.158

0.233

 

Flag question: Question 5

Question 510 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.

Group of answer choices

0.864

0.735

0.661

0.702

 

Flag question: Question 6

Question 610 pts

Which of the following most closely resembles the general form of an interval estimate?

Group of answer choices

Parameter = statistic ± error 

Statistic = parameter ± error

Statistic = parameter x error

Error = parameter ± statistic

 

Flag question: Question 7

Question 710 pts

The purpose of a confidence interval is to ______________.

Group of answer choices

Use a sample mean or mean difference to estimate the corresponding population mean or mean difference. 

Use a population mean or mean difference to predict a sample mean or mean difference.

Use a level of confidence to estimate a sample mean

Use the sample mean to determine a level of confidence

 

Flag question: Question 8

Question 810 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.

Group of answer choices

(36.803,  43.197) 

(29.791 , 52.558)

(31.282 , 45.775)

(48.445 , 56.613)

 

Flag question: Question 9

Question 910 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.

Group of answer choices

(5.081  ,  5.519) 

(4.897  ,  5.706) 

(4.686  ,  5.932)

(5.319 ,   6.257)

 

Flag question: Question 10

Question 1010 pts

Which of the following statements is true?

Group of answer choices

An interval estimate provides more information about a population characteristic than does a point estimate  

A point estimate provides more information about a population characteristic than does an interval estimate

Both the point and interval estimates are equally good providing more information about a population characteristic

None of the above

Saved at 20:59 

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Time elapsed: Hide

Attempt due: 17 Mar at 23:55

55 minutes, 25 Seconds