1) A coffee shop claims that it takes 115 seconds, on average, to serve their customers coffee through their drive-thru. Lucy, a statistics student, decides to test this claim. She randomly selects 15 orders and records the wait time it took for the customer to receive their coffee. Here are the times (in seconds). 85 122 135 100 153 153 116 99 65 130 175 113 188 142 134 a) Lucy wants to make a confidence interval to estimate the true mean wait time. Explain thoroughly why Lucy has or has not satisfied the “normal” condition for constructing a confidence interval. interval b) The 95% confidence interval that Lucy constructs is 109.1 to 145.6 seconds. Does the interval provide convincing evidence that the coffee shop is lying about their claim?
1) A coffee shop claims that it takes 115 seconds, on average, to serve their customers coffee through their drive-thru. Lucy, a statistics student, decides to test this claim. She randomly selects 15 orders and records the wait time it took for the customer to receive their coffee. Here are the times (in seconds).
|
85 |
122 |
135 |
100 |
153 |
|
153 |
116 |
99 |
65 |
130 |
|
175 |
113 |
188 |
142 |
134 |
a) Lucy wants to make a confidence
b) The 95% confidence interval that Lucy constructs is 109.1 to 145.6 seconds. Does the interval provide convincing evidence that the coffee shop is lying about their claim?
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