In Excel, when do you use NORM.DIST vs. when do you use NORM.INV

Use norm.DIST when looking for probability; norm.INV when looking for value

How can you identify a probability distribution?

P(x) values are between 0 and 1, inclusive, & add up to 1.

The formula shown is used to calculate:

margin of error for mean IF population std dev is not known

Which of the following is continuous variable?

The volume of coffee a student drinks each day.

The formula shown is used to calculate:

margin of error for mean IF population std dev is known

When do you use the Poisson distribution to calculate probability?

to calculate probability of a # of events per some interval

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Stats 245 Ch 4-7 Review

11 termsStudBud Administration27 plays

This quiz is a review of probability, distributions, normal probability, and confidence intervals #probability #statistics #confidence intervals #normal

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Questions 11

Answers

1
Volume is normally distributed with μ=50, sigma=10 and n=16. Determine P(mean>65).
6
0.0001
0.9999
0.0668
2
Which rule would apply to determine the probability of all tails when you flip 4 coins?
P(A or B) = P(A) + P(B) - P(A&B)
P(A&B) =P(A)*P(B)
P(A or B) = P(A) + P(B) -P(A) + P(B)
P(A&B) =P(A)*P(B|A)
3
In Excel, when do you use NORM.DIST vs. when do you use NORM.INV
norm.DIST for probability of a single value; norm.INV for a group
Use norm.DIST when looking for probability; norm.INV when looking for value
Use norm.INV when looking for probability; norm.DIST when looking for value
norm.INV for probability of a single value; norm.DIST for a group
4
Volume is normally distributed with μ=50 & sigma=10. Determine probability x exceeds 65.
1.5
0.9332
0.0668
0.1357
5
Given a discrete prob distribution as x and P(x) values, use this to calculate the mean:
mean=sum of P(x)
mean = nxp
mean=sum of xP(x)
mean=sum of x / n
6
To calculate the sample size required for an estimate of population proportion, the minimum you need to know is
margin of error & % confidence
estimate of sigma, margin of error & % confidence
population size, margin of error & % confidence
estimate of p, margin of error & % confidence
7
How can you identify a probability distribution?
P(x) values are between 0 and 1, inclusive, & add up to 1.
All P(x) values are between 0 and 1, inclusive.
None of the above
All P(x) values add up to one.
8
The formula shown is used to calculate:
confidence interval for proportion
margin of error for mean IF population std dev is known
conf. interval for mean IF population std dev is known
margin of error for mean IF population std dev is not known
9
Which of the following is continuous variable?
The number of students with high blood pressure.
The number of cars in in a race.
The volume of coffee a student drinks each day.
The number of cups of coffee a student drinks each day.
10
The formula shown is used to calculate:
conf. interval for mean IF population std dev isn't known
margin of error for mean IF population std dev is not known
margin of error for mean IF population std dev is known
confidence interval for proportion
11
When do you use the Poisson distribution to calculate probability?
to calculate probability of a # of events per some interval
to approximate the binomial when n is large
to calculate probability of a # of events per n trials

Stats 245 Ch 4-7 Review Flashcards | StudBud