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In: Statistics and Probability
Question 5 Consider the population of electric usage per month for houses. The standard deviation of...
| Question 5 | ||||
| Consider the population of electric usage per month for houses. The standard deviation of this population is 119 kilowatt-hours. What is the smallest sample size to provide a 90% confidence interval for the population mean with a margin of error of 32 or less? |
Solutions
orchestra answered 1 year agoRelated Solutions
In order to estimate the average electric usage per month, a sample of 47 houses were...
In order to estimate the average electric usage per month, a
sample of 47 houses were selected and the electric usage
determined. The sample mean is 2,000 KWH. Assume a population
standard deviation of 142 kilowatt hours. At 90% confidence,
compute the margin of error?
In order to estimate the average electric usage per month, a
sample of 46 houses were selected and the electric usage
determined. The sample mean is 2,000 KWH. Assume a population
standard deviation of 127...
Consider the following. 21, 11, 5, 26, 7, 4 Compute the population standard deviation of the...
Consider the following.
21, 11, 5, 26, 7, 4
Compute the population standard deviation of the
numbers. (Round your answer to two decimal place.)
_____________
(a) Double each of your original numbers and compute the
standard deviation of this new population. (Round your answer to
two decimal place.)
___________
(b) Use the results of part (a) and inductive reasoning to state
what happens to the standard deviation of a population when each
data item is multiplied by a positive constant...
Consider a population of 300 with a mean of 55 and a standard deviation equal to...
Consider a population of 300 with a mean of 55 and a standard
deviation equal to 22.
What is the probability of obtaining a sample mean of 57 or less
from a sample of 35?
Consider a population of 300 with a mean of 65 and a standard deviation equal to...
Consider a population of 300 with a mean of 65 and a standard
deviation equal to 25. What is the probability of obtaining a
sample mean of 67 or less from a sample of 40?
cumulative standardized normal table
round to four decimal points
A population has a mean of 50 and a standard deviation of 5. A sample of...
A population has a mean of 50 and a standard deviation of 5. A
sample of 100 observations will be taken. The probability that the
mean from that sample will be between 49 and 51 is
a)0.50
b)0.6826
c)0.8413
d)0.9544
The average rent in a city is $1500 per month with a standard deviation of $250....
The average rent in a city is $1500 per month with a
standard deviation of $250. Assume rent follows the normal
distribution. Use the empirical rule to answer the following
questions.
a. what percentage of rents are between 1250 and
1750?
b. what percentage of rents are less than 1250?
c. what percentage of rents are greater than 2000?
The average rent in a city is $1,440 per month with a standard deviation of $340....
The average rent in a city is $1,440 per month with a standard
deviation of $340. Assume rent follows the normal distribution. a.
What percentage of rents are between $760 and $2,120? What
percentage of rents are less than $760? c. What percentage of rents
are greater than $2,460?
The average rent in a city is $1,440 per month with a standard deviation of $340....
The average rent in a city is $1,440 per month with a standard
deviation of $340. Assume rent follows the normal distribution. a.
What percentage of rents are between $760 and $2,120? What
percentage of rents are less than $760? c. What percentage of rents
are greater than $2,460?
Consider a normal population with an unknown population standard deviation. A random sample results in x−...
Consider a normal population with an unknown population standard
deviation. A random sample results in x− = 47.50 and s2 = 27.04. a.
Compute the 90% confidence interval for μ if x− and s2 were
obtained from a sample of 15 observations. (Round intermediate
calculations to at least 4 decimal places. Round "t" value to 3
decimal places and final answers to 2 decimal places.) b. Compute
the 90% confidence interval for μ if x− and s2 were obtained from...
Consider a normal population with an unknown population standard deviation. A random sample results in x−...
Consider a normal population with an unknown population standard
deviation. A random sample results in x− = 48.44 and s2 = 10.89.
[You may find it useful to reference the t table.] a. Compute the
90% confidence interval for μ if x− and s2 were obtained from a
sample of 7 observations. (Round intermediate calculations to at
least 4 decimal places. Round "t" value to 3 decimal places and
final answers to 2 decimal places.) b. Compute the 90% confidence...
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