Question
In: Statistics and Probability
(1 point) (a) Find the size of each of two samples (assume that they are of...
(1 point) (a) Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proportions of boys and girls under 10 years old who are afraid of spiders. Use the conservative estimate for the value of both sample proportions. We want a 9696% confidence level and for the error to be smaller than 0.05.0.05.
Answer:
(b) Again find the sample size required, as in part (a), but with the knowledge that a similar student last year found that the proportion of boys afraid of spiders is 0.64 and the proportion of girls afraid of spiders was 0.83.
Answer:
***Answer for part (a) is NOT 841, 422, 3375
Answer for (b) is NOT 624, 328, 238, 25, 237***
Solutions
orchestra answered 2 years agoRelated Solutions
(1 point) (a) Find the size of each of two samples (assume that they are of...
(1 point) (a) Find the size of each of two samples (assume that
they are of equal size) needed to estimate the difference between
the proportions of boys and girls under 10 years old who are afraid
of spiders. Assume the "worst case" scenario for the value of both
sample proportions. We want a 99% confidence level and for the
error to be smaller than 0.08.
Answer:
(b) Again find the sample size required, as in part (a), but
with...
(1 point) (a) Find the size of each of two samples (assume that they are of...
(1 point) (a) Find the size of each of two samples (assume that
they are of equal size) needed to estimate the difference between
the proportions of boys and girls under 10 years old who are afraid
of spiders. Use the conservative estimate for the value of both
sample proportions. We want a 9696% confidence level and for the
error to be smaller than 0.05.0.05.
Answer:
(b) Again find the sample size required, as in part (a), but
with the...
(1 point) (a) Find the size of each of two samples (assume that they are of...
(1 point)
(a) Find the size of each of two samples (assume that they are
of equal size) needed to estimate the difference between the
proportions of boys and girls under 10 years old who are afraid of
spiders. Assume the "worst case" scenario for the value of both
sample proportions. We want a 99% confidence level and for the
error to be smaller than 0.02. Answer:
(b) Again find the sample size required, as in part (a), but
with...
Part 1) (a) Find the size of each of two samples (assume that they are of...
Part 1) (a) Find the size of each of two samples (assume that
they are of equal size) needed to estimate the difference between
the proportions of boys and girls under 10 years old who are afraid
of spiders. Assume the "worst case" scenario for the value of both
sample proportions. We want a 9999% confidence level and for the
error to be smaller than 0.08.0.08.
Answer:
(b) Again find the sample size required, as in part (a), but
with...
1 point) Independent random samples, each containing 60 observations, were selected from two populations. The samples...
1 point) Independent random samples, each containing 60
observations, were selected from two populations. The samples from
populations 1 and 2 produced 33 and 22 successes, respectively.
Test H0:(p1−p2)=0 against Ha:(p1−p2)≠0. Use α=0.08.
(a) The test statistic is____
(b) The P-value is ____
(c) The final conclusion is A. We can reject the null hypothesis
that (p1−p2)=0 and accept that (p1−p2)≠0. B. There is not
sufficient evidence to reject the null hypothesis that
(p1−p2)=0.
Assume that a population of size 5 specifies that all possible samples of size "3" are...
Assume that a population of size 5 specifies that all possible
samples of size "3" are extracted without repetition.
Values:
2,500.00
2,650.00
2,790.00
3,125.00
3,200.00
1) Show that the expected value of the standard sampling error
is greater than the standard deviation of the population.
2) Calculate the confidence interval of the sample means with
a significance level of 80% and indicate which samples are not
representative and develop an analysis.
3) Select the non-representative samples and calculate the
mean...
Assume that a population of size 5 specifies that all possible samples of size "3" are...
Assume that a population of size 5 specifies that all possible
samples of size "3" are extracted without repetition.
Values:
2,500.00
2,650.00
2,790.00
3,125.00
3,200.00
1. Show that the expected value of the standard sampling error
is greater than the standard deviation of the universe.
2. Select a sample and calculate the mean of the universe mean
with a confidence level of 84% and develop an analysis.
7. Use the population of {1, 3, 7}. Assume that the random samples of size n...
7. Use the population of {1, 3, 7}. Assume that the random
samples of size n = 2 Construct a sampling distribution of the
sample mean. After identifying the 9 different possible samples
(with replacement), find the mean of each sample, then construct a
table representing the sample the sampling distribution of the
sample mean. In the table, combine values of the sample mean that
are the same. (Hint: condense the table similar to examples
presented in class.)
a. Sample...
find the range variance and standard deviation for each of the two samples, then compare the...
find the range variance and standard deviation for each of the two
samples, then compare the two set of test results.
when investigating times required for drive theu servuce, the
following reaults were obtained.
restaurant a 120, 123, 153, 128, 124, 118, 154, 110
restaurant b : 115, 126 147, 156, 118, 110, 145, 137
Two samples, one of size 13 and the second of size 18, are selected to test...
Two samples, one of size 13 and the second of size 18, are
selected to test the difference between two population means and
σ is unknown.
Which distribution should be used for this test?
What is the critical value for a 10% level of significance for a
right tail test?
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