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?

Answers

Answer 1

Answer: 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

Answer 2

Answer:

Answer:

4.84

Step-by-step explanation:

got it right on edge2020

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Emily can ride her scooter 18 miles in 50 minutes.c. What is her unit rate in miles per hour?

Answers

Answer:

22.5 miles per hour (rounded answer)

Step-by-step explanation:

This is a fraction equal to

18 miles ÷ 0.8 hours

We want a unit rate where

1 is in the denominator,

so we divide top and bottom by 0.8

18 miles ÷ 0.8

0.8 hours ÷ 0.8

22.5 miles

1 hour

22.5 miles

hour

= 22.5 miles per hour

Answer:

there is no miles per hour because she wasn't riding for an hour

Write an expression that shows how to use the halving and doubling strategy to find 28 x 50

Answers

doubling strategy( 28 × 50 ) × 2 = 2800
halving strategy 2800/2 = 1400

There are three questions, and three choices of answers (A,B and C) for each question. Given that only one of the possible choices (A,B and C) is correct for each question, state the probability that the student guesses:Q1: 1 correct answer. Q2: 2 correct answer
Q3: 3 correct answer. Q4: 0 correct answer

Please use tree diagram to explain.

Answers

q2—_-___-_-__—-__-_-_-___—-__-__—-__-_

Can someone help or explain the problem to me

Answers

Answer:

I think I explained the circle one before so I'll explain the left question because I wanted some points.

here,

area of circle is πr² which is given= 12 π cm²

so πr²= 12π

r= 2√3

d= 2r= 4√3

AB is diameter so AB= 4√3

I need help on number 5

Answers

A fraction is undefined if its denominator is zero, because then it's saying
"Division by zero !" which is a definite no-no.

Can the denominator of the fraction in #5 ever be zero ?

The denominator is a quadratic polynomial. Do you know
how to solve (a quadratic polynomial) = 0 ?

This problem is even easier than that, because it gives you some choices.
So you don't even have to solve the quadratic equation. All you have to do
is check out the choices.
Do you see choice of 'x' values that make the denominator zero ?

Big sloppy hint: Look at choice-E very very carefully.

Is that enough help ?

Marshas cat weighs 15.41 her cat only weighs 4.79 pounds. about how much more does her cat weigh?

Answers

Answer:

10.31

Step-by-step explanation:

15.41-4.79=10.31

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Need help with an explanation please!! 15 points for whoever can help me