6) To obtain a large-sample confidence interval for the population proportion, p
ID: 3157080 • Letter: 6
Question
6)
To obtain a large-sample confidence interval for the population proportion, p, use the:
t distribution
binomial distribution
normal distribution
chi-square distribution
7) A sample size of 14 is used t find a confidence interval. The number of degrees of freedom needed is __________.
8)In determining the necessary sample size for a 95% confidence interval, the value 0.95 must be substituted into the formula z/2
True or False
9) The area under the standard normal curve between -z and z is equal to 1 - .
True or False
10)
Which of the following is not true for the t distribution?
Its shape depends on the number of degrees of freedom
Its mean depends on the number of degrees of freedom
It is symmetrical
It is bell shaped
t distribution
binomial distribution
normal distribution
chi-square distribution
Explanation / Answer
6.
As it is a large sample,
OPTION C: NORMAL DISTRIBUTION [ANSWER]
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7.
As n = 14, then
df = n -1 = 13 [ANSWER]
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8.
FALSE. The corresponding value for z(alpha/2) when c = 0.95 is 1.96.
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