Question
In: Statistics and Probability
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 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 1 year agoRelated Solutions
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...
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...
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.)
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...
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?
Automobile repair costs continue to rise with the average cost now at $367 per repair.†
You may need to use the appropriate appendix table to answer
this question.
Automobile repair costs continue to rise with the average cost
now at $367 per repair.† Assume that the cost for an automobile
repair is normally distributed with a standard deviation of $88.
Answer the following questions about the cost of automobile
repairs.
(a) What is the probability that the cost will be more than
$490? (Round your answer to four decimal places.)
(b) What is the probability...
Automobile repair costs continue to rise with the average cost now at $367 per repair.†
Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs. (a) What is the probability that the cost will be more than $430? (Round your answer to four decimal places.) Incorrect: Your answer is incorrect. (b) What is the probability that the cost will be less than $280?...
Automobile repair costs continue to rise with the average cost now at $367 per repair.†
Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs.
(a)
What is the probability that the cost will be more than $490? (Round your answer to four decimal places.)
(b)
What is the probability that the cost will be less than $260? (Round your answer to...
In 2013, selected automobiles had an average cost of $18,000. The average cost of those same...
In
2013, selected automobiles had an average cost of $18,000. The
average cost of those same automobiles is now $21,960. What was the
rate of increase for these automobiles between the two time
periods? Round your answer to the nearest whole percent.
True and False 1) Average total cost and average variable cost are minimized at the same...
True and False
1) Average total cost and average variable cost are
minimized at the same level of output.
2) When marginal cost is between average variable cost
and average total cost, marginal cost is increasing.
3) Average total cost of producing 100 units of output
is $5. If the marginal cost of producing the 101st unit is $4, then
average total cost of 101 units is less than $5.
4) Average variable costs fall continuously as quantity
of output...
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