Question
In: Statistics and Probability
Suppose a grocery store is considering the purchase of a new self-checkout machine that will get...
Suppose a grocery store is considering the purchase of a new self-checkout machine that will get customers through the checkout line faster than their current machine. Before he spends the money on the equipment, he wants to know how much faster the customers will check out compared to the current machine. The store manager recorded the checkout times, in seconds, for a randomly selected sample of checkouts from each machine. The summary statistics are provided in the table.
| Group | Description | Sample size |
Sample mean (min) |
Sample standard deviation (min) |
Standard error estimate (min) |
|---|---|---|---|---|---|
| 1 | old machine | n1=51n1=51 | ¯¯¯x1=128.4x¯1=128.4 | s1=29.8s1=29.8 | SE1=4.17283SE1=4.17283 |
| 2 | new machine | n2=48n2=48 | ¯¯¯x2=113.0x¯2=113.0 | s2=24.2s2=24.2 | SE2=3.49297SE2=3.49297 |
df=94.99897df=94.99897
Compute the lower and upper limits of a 95% confidence interval to estimate the difference of the mean checkout times for all customers. Estimate the difference for the old machine minus the new machine, so that a positive result reflects faster checkout times with the new machine. Use the Satterthwaite approximate degrees of freedom, 94.99897. Give your answers precise to at least three decimal places.
upper limit:
lower limit:
Solutions
orchestra answered 1 year agoRelated Solutions
Suppose a grocery store is considering the purchase of a new self-checkout machine that will get...
Suppose a grocery store is considering the purchase of a new
self-checkout machine that will get customers through the checkout
line faster than their current machine. Before he spends the money
on the equipment, he wants to know how much faster the customers
will check out compared to the current machine. The store manager
recorded the checkout times, in seconds, for a randomly selected
sample of checkouts from each machine. The summary statistics are
provided in the table. Group Description...
Suppose grocery stores in the region purchase a large stocks of self-checkout machines, which are a...
Suppose grocery stores in the region purchase a large stocks of
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the labor demand for checkout workers.
Group of answer choices
decrease
increase
be unrelated to
have no impact on
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Question options:
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1.01
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