Consider a t distribution with
19
degrees of freedom. Compute
P≤t−1.22
. Round your answer to at least three decimal places.
Consider a t distribution with
10
degrees of freedom. Find the value of
c
such that
=P<−c<tc0.90
. Round your answer to at least three decimal places.
Consider a t distribution with 7degrees of freedom.
Compute
P(t+≥ −1.05) Round your answer to at least three decimal
places.
Consider a t distribution with 11degrees of freedom.
Find the value of c such that
=P(-c < t < c)= 0.95 Round your answer to at least three
decimal places.
P(t≥ -1.05)=
c=
a)For the t distribution with 15 degrees of freedom, calculate
P(T < 0.691).
b)Consider the population of electric usage per month for
houses. The standard deviation of this population is 132
kilowatt-hours. What is the smallest sample size to provide a 90%
confidence interval for the population mean with a margin of error
of 34 or less? (Enter an integer number.)
c)In order to estimate the average electric usage per month, a
sample of 47 houses were selected and the...
Suppose that x2 follows a chi-square
distribution with 30 degrees of freedom. Compute
P(17≤x2≤
46). Round your answer to at least three decimal
places.
Suppose again that x2 follows a chi-square
distribution with 30 degrees of freedom. Find k such that
P(x2≥
k) = 0.01. Round your answer to at
least two decimal places.
Find the median of the chi-square distribution with 30 degrees
of freedom. Round your answer to at least two decimal places.
Consider a random variable T that has a t-distribution with k =
16 degrees of freedom. What is P(T > 1.8)?
Group of answer choices
0.0454
0.9546
0.2499
0.4742
0.8000
Find the value of t for a t-distribution with 3 degrees of
freedom such that the area to the left of t equals 0.10.
Possible Answers:
A. 5.841
B. 4.541
C. -2.333
D. -1.638
a.
Find the degrees of freedom for unequal variance test.
(Round down your answer to the nearest whole
number.)
Degrees of freedom
b.
State the decision rule for 0.01 significance level.
(Round your answer to 3 decimal places.)
Reject H0 if
t>
c.
Compute the value of the test statistic. (Round your
answer to 3 decimal places.)
Value of the test statistic
d.
What is your decision regarding the null hypothesis? Use the
0.01 significance level.
Null...
Consider the t-distribution with 18 degrees of freedom. Use
Table D to find the proportion of this distribution that lies
below
t=−1.33
Then use excel to confirm your result. Give your answer to two
decimal places.
P(t < −1.33) =
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...