# valid probability distribution quiz, statistics homework help

Probability is ____. (Points : 2) the likelihood that some event will occur

always expressed as a value between 0 and 1

is the ratio of the number of favorable cases to the total number of possible cases

all of the above

Question 2.

**2. **The sum of the probability that an event will occur and the probability that it will not occur is ____. (Points : 2) different for each case

equal to P(E)

equal to P(E)-1

equal to 1

Question 3.

**3. **The probability that an event will occur is written as follows (Points : 2) P=1

P(E)

P(E-1)

P(not E)

Question 4.

**4. **Probability values are (Points : 2) always more than 1.0

always positive numbers

only calculated for one-tailed tests

always expressed as a fraction

Question 5.

**5. **What proportion of a normal distribution is located in the tale beyond a Z score of +1.00? (Points : 2) 0.8413

0.1587

0.168

0.3174

Question 6.

**6. **A random sample requires that (Points : 2) every individual has an equal chance of being selected

individuals are selected from a convenience group

no one knows how many people are in the population

both a and b are correct

Question 7.

**7. **For a population with a mean of 80 and a standard deviation of 10, what is the Z score corresponding to an individual score of 95? (Points : 2) +0.25

+0.50

+0.75

+1.50

Question 8.

**8. **If the researcher’s alternative hypothesis stated, “females in this test will score higher than males” ____. (Points : 2) this would be a two-tailed test

it would be too early to make that statement

this would be a null hypothesis

this would be a one-tailed test

Question 9.

**9. **If the null hypothesis stated that Group A results would be the same as Group B, would this represent a one-tailed or two-tailed test? (Points : 2) One-tailed

Two-tailed

it could be either one depending on the groups

cannot determine without additional information

Question 10.

**10. **For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92? (Points : 2) +0.50

+1.0

+1.20

+12.00

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