Question
In: Statistics and Probability
2. A simple random sample of 736 photographers found that 65% plan to purchase new equipment...
2. A simple random sample of 736 photographers found that 65% plan to purchase new equipment within the next year. (Make sure to also state your results in a sentence.)
a. What is the SD of the sample?
b. Find a 90% confidence interval for the percentage of photographers who plan to buy equipment.
c. A camera company will have a sale on its products if, at the 95% confidence level, 70% of all photographers plan to purchase new equipment. Will the company have the sale?
Solutions
orchestra answered 1 year agoRelated Solutions
A simple random sample of 60 items resulted in a sample mean of 65. The population...
A simple random sample of 60 items resulted in a sample mean of
65. The population standard deviation is 16. a. Compute the 95%
confidence interval for the population mean (to 1 decimal). ( , )
b. Assume that the same sample mean was obtained from a sample of
120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals). ( , ) c. What is the effect of a larger
sample size on the margin of...
A simple random sample of 60 items resulted in a sample mean of 65. The population...
A simple random sample of 60 items resulted in a sample mean of
65. The population standard deviation is 16. a. Compute the 95%
confidence interval for the population mean (to 1 decimal). ( , )
b. Assume that the same sample mean was obtained from a sample of
120 items. Provide a 95% confidence interval for the population
mean (to 2 decimals). ( , ) c. What is the effect of a larger
sample size on the margin of...
A simple random sample has a sample size of n = 65. Given the population is...
A simple random sample has a sample size of n = 65. Given the
population is normally distributed, find the critical value ta/2
corresponding to a 99% confidence level.
a) 2.678
b) 2.575
c) 2.000
d) 2.660
A simple random sample of size n is drawn. The sample mean is found to be...
A simple random sample of size n is drawn. The sample mean is
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A). Construct a 95% confidence interval about if the sample
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A simple random sample of size n is drawn. The sample mean is found to be...
A simple random sample of size n is drawn. The sample mean is
found to be 17.6, and the sample standard deviation, s, is found
to be 4.7.
Construct a 99% confidence interval about if the sample size,
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In a random sample of 65 professional actors, it was found that 43 were extroverts. (a)...
In a random sample of 65 professional actors, it was found that
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(a) Let p represent the proportion of all actors who
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(b) Find a 95% confidence interval for p. (Round your
answers to two decimal places.)
lower limit
upper limit
8. If a simple random sample of 215 students was surveyed, and it was found that...
8. If a simple random sample of 215 students was surveyed, and
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have iPhones?
A simple random sample of size n is drawn. The sample mean, x, is found to...
A simple random sample of size n is drawn. The sample mean, x,
is found to be 18.5, and the sample standard deviation, s, is
found to be 4.6.
(a) Construct a 95% confidence interval about μ if the sample
size, n, is 34.
Lower bound: ___
Upper bound: ___
(Use ascending order. Round to two decimal places as
needed.)
(b) Construct a 95% confidence interval about μ if the sample
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Lower bound: ___
Upper bound:...
A simple random sample of size n is drawn. The sample mean, x, is found to...
A simple random sample of size n is drawn. The sample
mean, x, is found to be 35.1, and the sample standard deviation, s,
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a) Construct a 90% confidence interval for μ if the
sample size, n, is 100.
b) Construct a 90% confidence interval for μ if the
sample size, n, is 40. How does decreasing the sample size affect
the margin of error, E?
c) Construct a 96% confidence interval for μ if...
A simple random sample of size n is drawn. The sample mean, x , is found...
A simple random sample of size n is drawn. The sample mean, x
, is found to be 18.5 , and the sample standard deviation, s, is
found to be 4.3.
(a) Construct a 95% confidence interval about mean if the
sample size, n, is 35.
(b) Construct a 95% confidence interval about mean if the
sample size, n, is 71. How does increasing the sample size affect
the margin of error, E?
(c) Construct a 99% confidence interval about...
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