Question

A 90% confidence interval for the proportion of coffee drinkers that add sugar and creme has results in the following output:

one sample proportion summary confidence interval:

p: proportion of success

method:standard-wald

90% confidence interval results:

proportion: p

count:1136

total:1803

sample prop: 0.63006101

std. edrr.: 0.011369948

l. limit: 0.61135911

u. limit: 0.6487629

a. Identify the values for n, p, ˆ q, ˆ and E.

b. Write a statement that interprets the 90% confidence interval

Answer #1

An alternative way to calculate margin of error that is E is

( l. Limit + u. Limit )/2

= ( 0.61135911 + 0.6486629 )/2

= 0.018702

Comment about the change in proportion of atheists over
the period.What are the conditions required to make the
inferences in part (a) valid? Are the conditions met in this case?
Explain briefly.
a) One sample proportion confidence
interval:
Outcomes in : response
Success : atheist
Group by: year
p : Proportion of Successes
95% confidence interval results:
year
Count
Total
Sample Prop.
Std. Err.
L. Limit
U. Limit
2005
1428
13608
0.10493827
0.0026272191
0.099789017
0.11008753
2012
3476
51927
0.066940127
0.0010967343...

Find a 90% confidence interval for the proportion p if the sample
has = 0.23 with n=300 and standard error SE=0.024.

A student was asked to find a 90% confidence interval for the
proportion of students who take notes using data from a random
sample of size n = 88. Which of the following is a correct
interpretation of the interval 0.1 < p < 0.3?
Check all that are correct.
The proprtion of all students who take notes is between 0.1 and
0.3, 90% of the time.
There is a 90% chance that the proportion of notetakers in a
sample...

A student was asked to find a 90% confidence interval for the
proportion of students who take notes using data from a random
sample of size n = 78. Which of the following is a correct
interpretation of the interval 0.13 < p < 0.27?
Check all that are correct.
0 There is a 90% chance that the proportion of the population is
between 0.13 and 0.27.
0 The proprtion of all students who take notes is between 0.13
and...

A 90% confidence interval for a population proportion is given
as 0.641 < p < 0.767. Round your answers to
3 decimal places.
(a) Calculate the sample proportion.
p̂ =
(b) Calculate the margin of error.
E =

HW 9
Assume that a 90% confidence interval for a population
proportion has lower bound = 0.24 and upper bound = 0.34.
*The sample proportion based on the collected data
is
[
Select ]
["0.29", "unknown", "0.34",
"0.24"]
*The margin of error is
[ Select ]
["0.025", "0.010",...

1. For a pair of sample x- and y-values, what is the difference
between the observed value of y and the predicted value of y? a) An
outlier b) The explanatory variable c) A residual d) The response
variable
2. Which of the following statements is false:
a) The correlation coefficient is unitless. b) A correlation
coefficient of 0.62 suggests a stronger correlation than a
correlation coefficient of -0.82. c) The correlation coefficient,
r, is always between -1 and 1....

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