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Grace [21]
3 years ago
12

A recent survey of 8,000 high school students found that the mean price of a prom dress was $195.00 with a standard deviation of

$12.00. Alyssa thinks that her school is more fashion conscious and spent more than $195.00. She collected data from 20 people in her high school and found that the average price spent on a prom dress was $208.00. Which of the following is the correct z-statistic for this situation?
Mathematics
2 answers:
Sloan [31]3 years ago
6 0

Answer:

4.84

Step-by-step explanation:

got it right on edge2020

cluponka [151]3 years ago
4 0
The z-statistic can be calculated as the difference in the population mean and sample mean divided by the standard error. The standard error can be calculated as the standard deviation divided by square root of sample size. The standard error: SE = 12/ sqrt(20) = 2.68 The z-statistic: (195 -208) 2.68 = -4.86
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Answer:

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Step-by-step explanation:

For starters, we use the relation.

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Again, we have 40000 + 10000x on another hand. Question says to add 10000 people everytime $3 is deducted.

Since (40000 + 10000x) is the number of people, we multiply it by $4.50, the average amount each person spends is then gotten to be

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900000 + 105000x - 30000x² = 0 or

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From our earlier equations, the new price then is

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The new attendance also is

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