Please help me on this math problem

A university business school is interested in the difference of GPAs across majors. They collect a sample of 7 students from eac

nydimaria [60]

Answer:

NO

Step-by-step explanation:

Hello!

For this it's been made an ANOVA for four different variables, this means, in the null hypothesis there were four population means tested. When you reject the null hypothesis, you can assume that at least one of the GPA for the four majors is different. To know which one is different, or, if the GPA of finance students is different from the accounting students, you'll have to do an individual test between these two populations.

Hope you have a SUPER day!

6 0

4 years ago

The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation St

AysviL [449]

Answer:

a) 0.0668 = 6.68% probability that a domestic airfare is $550 or more

b) 0.1093 = 10.93% probability than a domestic airfare is $250 or less

c) 0.6313 = 63.13% probability that a domestic airfare is between $300 and $500

d) The cost for the 3% highest domestic airfares are $592 and higher.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 385, \sigma = 110$

a. What is the probability that a domestic airfare is $550 or more (to 4 decimals)?

This is 1 subtracted by the pvalue of Z when X = 550. So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{550 - 385}{110}$

$Z = 1.5$

$Z = 1.5$ has a pvalue of 0.9332

1 - 0.9332 = 0.0668

0.0668 = 6.68% probability that a domestic airfare is $550 or more

b. What is the probability than a domestic airfare is $250 or less (to 4 decimals)?

This is the pvalue of Z when X = 250. So

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{250 - 385}{110}$

$Z = -1.23$

$Z = -1.23$ has a pvalue of 0.1093

0.1093 = 10.93% probability than a domestic airfare is $250 or less

c. What if the probability that a domestic airfare is between $300 and $500 (to 4 decimals)?

This is the pvalue of Z when X = 500 subtracted by the pvalue of Z when X = 300. So

X = 500

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{500 - 385}{110}$

$Z = 1.045$

$Z = 1.045$ has a pvalue of 0.8519

X = 300

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{300 - 385}{110}$

$Z = -0.77$

$Z = -0.77$ has a pvalue of 0.2206

0.8519 - 0.2206 = 0.6313

0.6313 = 63.13% probability that a domestic airfare is between $300 and $500

d. What is the cost for the 3% highest domestic airfares?

At least the 97th percentile, so at least X when Z has a pvalue of 0.97. So X when Z = 1.88.

$Z = \frac{X - \mu}{\sigma}$

$1.88 = \frac{X - 385}{110}$

$X - 385 = 1.88*110$

$X = 592$

The cost for the 3% highest domestic airfares are $592 and higher.

7 0

3 years ago

On a train car there are 30 rows of seats and each row has 5 seats .find the total number of seats on 6 train cars .draw a model

Vinil7 [7]

Answer:

900

Step-by-step explanation:

30 x 5 = 150 and 150 x 6 = 900. You would make a model with 5 rows of 30, then make 6 of them

3 0

4 years ago

Find the value of k so that the graph of 13y + kx = 4 and the line containing the points (5, -8) and (2, 4) are parallel.

guajiro [1.7K]

the graph of 13y + kx = 4 and the line containing the points (5, -8) and (2, 4) are parallel.

We find the slope of parallel line using two given points

(5, -8) and (2, 4)

Slope formula is

$slope = \frac{y_2-y_1}{x_2-x_1}$

$slope = \frac{4-(-8)}{2-5}$

$slope = \frac{12)}{-3}=-4$

so slope = -4

Slope of any two parallel lines are always equal

Lets find the slope of the equation 13y + kx = 4

Subtract kx on both sides

13 y = -kx + 4

Divide both sides by 13

$y= \frac{-kx}{13} + \frac{4}{13}$

Now slope = -k/13

We know slope of parallel lines are same

So the slope of 13y + kx = 4 is also -4

Hence we equation the slope and find out k

$\frac{-k}{13}=-4$

Multiply by 13 on both sides and divide by -1

k = 52

the value of k = 52

4 0

3 years ago

Read 2 more answers

At a local hardware store, Ms. Jones learned that 1 would cost her $.50, 12 would cost $1.00, and the price of 144 would be $1.5

saw5 [17]

Answer:

how the heck would I know what she's buying the question itself doesn't even state that

7 0

3 years ago

Read 2 more answers