QUESTION 1
Using the t-table found HERE find find the t critical value
for:
Degrees of Freedom = 5
Upper-tail probability = 0.10
3 points
QUESTION 2
Using the t-table found HERE find find the t critical value
for:
Degrees of Freedom = 11
Upper-tail probability = 0.005
3 points
QUESTION 3
Using the t-table found HERE find find the t critical value
for:
Degrees of Freedom = 23
Upper-tail probability = 0.05
3 points
QUESTION 4...
a) The critical value of t for a 99% confidence interval with
df equals=88.
b) The critical value of t for a 90% confidence interval with
df equals=107.
A) Find the z critical value for a 90% confidence level:
Zc=
B) Find the z critical value for an 84% confidence level:
Zc=
C) The higher the confidence, the narrower the confidence
interval
True or False
D) The greater the sample size, the mnarrower the confidence
interval
True or False
E) In a recent study of 84 eighth graders, the mean number of
hours per week that they watched TV was 22.3. Assume population
standard deviation is 5.8 hours....
#9 find the minimum sample size for the following. you wish to
estimate 90% confidence and within 3% of the true population, the
proportion of senior citizens that need to be treated for heart
disease. there is no initial estimate for p-hat (Hint: think half
and half) Show all work.
#10 using the data from #9 - if there was an initial estimate of
30%, what would be the minimum sample size?
A student was asked to find a 90% confidence interval for widget
width using data from a random sample of size n = 20. Which of the
following is a correct interpretation of the interval 11.8 < μ
< 21.7?
Check all that are correct.
The mean width of all widgets is between 11.8 and 21.7, 90% of
the time. We know this is true because the mean of our sample is
between 11.8 and 21.7.
With 90% confidence, the...
Find the T-critical values that correspond to a 90% confidence
level (two-tails) when the sample size is 15. Draw the picture if
it helps.
a) -1.753, 1.753
b) -1.761, 1.761
c) -2.145, 2.145
d) -1.345, 1.345
e) -1.645, 1.645