Question
In: Statistics and Probability
17. Claim: The average cost to repair washing machine A is less than the average cost...
17. Claim: The average cost to repair washing machine A is less than the average cost to repair washing machine B. Test at α = 0.1
Data: A sample of 10 washing machine A’s have an average repair cost of $208 and a standard deviation of $25. A sample of 15 washing machine B’s have an average repair cost of $221 and a standard deviation of $29.
Assume that the population standard deviations for repair costs are the same for each
(a) Are these data statistically significant evidence to support the claim?
(b) Are these data statistically significant evidence to refute the claim?
Solutions
orchestra answered 2 years agoRelated Solutions
17. Claim: The average cost to repair washing machine A is the same as the average...
17. Claim: The average cost to repair washing machine A is the
same as the average cost to repair washing machine B. Test at α =
0.05 Data: A sample of 14 washing machine A’s have an average
repair cost of $208 and a standard deviation of $25. A sample of 16
washing machine B’s has an average repair cost of $221 and a
standard deviation of $29.
Assume that the population standard deviations for repair costs are
the same...
Claim: The average cost to repair washing machine A is the same as the average cost...
Claim: The average cost to repair washing machine A is the same
as the average cost to repair washing machine B. Test at α = 0.1
Data: A sample of 24 washing machine A’s have an average repair
cost of $208 and a standard deviation of $22. A sample of 26
washing machine B’s have an average repair cost of $221 and a
standard deviation of $19. Assume that the population standard
deviations for repair costs are the same for...
14. Claim: The average cost to repair a smart phone is less than $100. Test at...
14. Claim: The average cost to repair a smart phone is less than
$100. Test at α = 0.1. Data: 7 smart phone repairs are chosen at
random. The average of these is $95.56, with a standard deviation
of $20.
(a) Are these data statistically significant evidence to support
the claim?
(b) Are these data statistically significant evidence to refute
the claim?
A consumer advocate agency wants to find the mean repair cost of a washing machine. As...
A consumer advocate agency wants to find the mean repair cost of
a washing machine. As part of the study 40 repair costs were
selected and the mean repair cost was determined to be $150.00.
From past studies the agency assumes that σ = $21. Construct a 90%
confidence interval for the population mean. (Round confidence
interval values to two decimal places.)
If the price is less than the average total cost but higher than the average variable...
If the price is less than the average total cost but higher than
the average variable cost, then the firm is making a _________.
a. loss and is making a negative contribution to fixed
costs
b. loss but will continue to produce in the short-run
c. loss and will shut down in the short-run
d. profit
What two types of market scopes did Michael Porter use in
developing his generic strategies model?
Broad and narrow.
Cost leadership and focus.
Benefit...
A washing machine manufacturing company claims that an average washing machine lasts 300 days. A researcher...
A washing machine manufacturing company claims that an average
washing machine lasts 300 days. A researcher randomly selects 15
machines for testing. The sample machines last an average of 290
days with a standard deviation of 50 days. If the company's claim
is true, find the range of probability (area in
right tail from the table) that 15 randomly selected machines would
have an average life of no more than 290 days, in other words where
does your t-statistic lie...
You wish to test the claim that the average IQ score is less than 100 at...
You wish to test the claim that the average IQ score is less
than 100 at the .05 significance level. You determine the
hypotheses are:
Ho: μ=100
H1:μ<100
You take a simple random sample of 38 individuals and find the
mean IQ score is 95.8, with a standard deviation of 15.2. Let's
consider testing this hypothesis two ways: once with assuming the
population standard deviation is not known and once with assuming
that it is known.
Round to three decimal...
You wish to test the claim that the average IQ score is less than 100 at...
You wish to test the claim that the average IQ score is less
than 100 at the .05 significance level. You determine the
hypotheses are:
Ho: μ=100
H1:μ<100
You take a simple random sample of 38 individuals and find the
mean IQ score is 95.8, with a standard deviation of 15.2. Let's
consider testing this hypothesis two ways: once with assuming the
population standard deviation is not known and once with assuming
that it is known.
Round to three decimal...
You wish to test the claim that the average IQ score is less than 100 at...
You wish to test the claim that the average IQ score is less
than 100 at the .01 significance level. You determine the
hypotheses are:
Ho: μ=100
H1:μ<100
You take a simple random sample of 79 individuals and find the
mean IQ score is 96.1, with a standard deviation of 14.8. Let's
consider testing this hypothesis two ways: once with assuming the
population standard deviation is not known and once with assuming
that it is known.
Round to three decimal...
You wish to test the claim that the average IQ score is less than 100 at...
You wish to test the claim that the average IQ score is less
than 100 at the .025 significance level. You determine the
hypotheses are:
Ho: μ=100
H1:μ<100
You take a simple random sample of 60 individuals and find the
mean IQ score is 95.7, with a standard deviation of 16. Let's
consider testing this hypothesis two ways: once with assuming the
population standard deviation is not known and once with assuming
that it is known.
Round to three decimal...
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