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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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Sunny_sXe [5.5K]

Answer:

They will have to pay $5,692,500 in 90 days.

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Step-by-step explanation:

This is a simple interest problem.

The simple interest formula is given by:

E = P*I*t

In which E are the earnings, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time, in years..

After t years, the total amount of money is:

T = E + P.

In this question:

P = 5500000, I = 0.14

3 months is 3/12 = 1/4 = 0.25 of an year. So t = 0.25

Then the interest accrued is:

E = P*I*t = 5500000*0.14*0.25 = 192500

What they will have to pay:

T = 192500 + 5500000 = 5692500

They will have to pay $5,692,500 in 90 days.

Deben pagar $5,692,500 pagar al final de un período de 90 días.

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8 0
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Answer:

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Answer:

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