1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pshichka [43]
3 years ago
6

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no

difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the distribution of the difference of sample means is 16.66, what is the 95% confidence interval for the population mean difference? A)between -33.2 and + 33.2 B)between -49.9 and +49.9 C)between -102.8 and +102.8 D)between -154.2 and +154.2
Mathematics
1 answer:
xxMikexx [17]3 years ago
6 0
<span>The 95% confidence interval is equal to two standard deviations either side of the mean, so in this case, the answer would be +/-(2 * 16.6) from the mean, or -33.2 and +33.2 points from the sample mean. This would give a response of A.</span>
You might be interested in
Collen family plans to paint the window of their house. her father will paint twice as many window as her mother, and collen and
valina [46]

Answer:

21 windows

Step-by-step explanation:

collen family plans to paint the windows of their house. her father will paint twice as many windows as her mother, and collen and her 2 brothers will paint an equal number of the rest of the windows. Colleen decided to do her own share and her mother's share and paints 7 window, which is one less than her father's share. how many windows are in their house?

Answer: Let the number of window Collen father would paint be a while that of her mother be b. Since her father will paint twice as many window as her mother, therefore the number of windows painted by the father a = 2b

Let the number of windows that would be needed to be painted each by Colleen and her 2 brothers be c because they would paint the equal number of windows.

The total number of windows to be painted = 2b + b + c + c + c = 3b + 3c = 3(b + c).

Collen painted 7 windows as her mother and her own share which is one less than the fathers share. Therefore b + c = 7.

Also the fathers share a = 2b = 7 + 1 = 8 windows. Therefore b = 4 which is the mother share

Therefore the total number of windows = 3(b + c) = 3(7) = 21 windows

3b + 3c =  21

3(4) + 3c = 21

12 + 3c = 21

3c = 21 - 12

3c = 9

c = 3 which is collen and her brothers share

6 0
3 years ago
Help!! Would the answer be c??
Westkost [7]
The answer is a. jksksvw
4 0
2 years ago
A scientist needs to make 2 liters of saline solution (salt water), in which the salt
gulaghasi [49]

Answer:

1.60 L of 10% solution

0.40 L of 35% solution

Step-by-step explanation:

If x = amount of 10% saline solution, and y = amount of 35% saline solution, then:

x + y = 2

0.10x + 0.35y = 0.15(2)

Solve with substitution:

0.10x + 0.35(2 − x) = 0.15(2)

0.10x + 0.70 − 0.35x = 0.30

0.40 = 0.25x

x = 1.60

y = 0.40

5 0
3 years ago
jeffery read that he should drink 8 cups of water a day He has a water bottle that measures water in fluid ounces How many fluid
adoni [48]

Answer:

What are yu askin

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Which equations below represent nonlinear functions?
Brilliant_brown [7]
Answer: y = x^2 - 2 does not represent a linear function because the squared exponent above the variable makes that equation quadratic. Quadratic equations look like parabolas on a graph, rather than lines.
4 0
2 years ago
Other questions:
  • T object]user: the lengths of the sides of a certain triangle are 3, 4, and 5 respectively. what can you say about the triangle?
    6·1 answer
  • The classroom has 4 desks in each row. There are 5 rows. How many desks are there in the classroom?
    8·2 answers
  • Explain the difference between (-5)2 and -5)2
    11·1 answer
  • a pump can fill a 750-gallon tank in 35 minutes. How long will it take to fill a 1000-gallon tank with this same pump?
    14·1 answer
  • Can someone please help me with this answer
    13·1 answer
  • Can anyone help me pleaseeee
    7·1 answer
  • It is 2.7 from Salma's house to the nearest mailbox. How far is it in meters?
    5·1 answer
  • Pleasee, whats the substitution of 9x+2y=-3 and -9x-y=-3
    8·1 answer
  • What's the value of 280?
    15·2 answers
  • SOME HELP HERE PLEASE?!!
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!