9. For a standard normal distribution, what is the probability
that Z is greater than -1.35? Round to four decimals and use
leading zeros.
10. For a standard normal variable, what is the probability that
Z is between -2.00 and -1.00? Round to four decimals and use
leading zeros.
11. For a dataset that follows the standard normal distribution,
what is the probability that Z is between 2.00 and 3.00? Round to
four decimals and use leading zeros.
What is the probability of obtaining a sample mean greater than
M=70 for a random sample of n= 16 scores selected from a normal
population with a mean of μ=60 and a standard deviation of
σ=20?
For Exercises find the critical value from Table L for the rank correlation coefficient, given sample size n and a. Assume that the test is two-tailed.n = 14, α = 0.01
What is the critical F value when the sample size for the
numerator is sixteen and the sample size for the denominator is
ten? Use a two-tailed test and the 0.02 significance level. (Round
your answer to 2 decimal places.)
Find the critical value of t for a t-distribution with 30
degrees of freedom such that the area between -t and t is 99%
A student records the repair costs for 25 randomly selected
computers from a local repair shop where he works. A sample mean of
$216.53 and standard deviation of $15.86 are subsequently computed.
Assume that the population distribution is approximately normal and
s is unknown. Determine the 98% confidence interval for the mean
repair cost for all...
A probability distribution of all possible sample means for a
particular sample size is the _____.
The mean of all possible sample means is __________________ the
population mean.
If we decrease the sample size from 20 to 10, the standard error
of the mean will ________________.
If a population follows the normal distribution, what is the
shape of the distribution of the sample means?
A _____________________ is a single value computed from sample
information used to estimate a population parameter....
What is the critical t-value for each of the following
scenarios use (t-distribution and assume “gold standard”
p-value; each blank worth 1 point):
a. N = 43, one-tailed Independent Samples t-test --> Critical
t-value is __________.
If calculated t = 2.00, what is your decision regarding the
null: __________.
b. N = 35, two-tailed Paired Samples t-test --> Critical
t-value is __________.
If calculated t = 2.00, what is your decision regarding the
null: __________.
Find the probability that the sample mean is less than 984 if a
sample of size 100 is taken from a population with a mean of 1000
and a standard deviation of 300.