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
Kisachek [45]
3 years ago
13

Questions on a statistics exam are considered good questions provided the questions discriminate between students who have studi

ed for the exam and those who have not studied. Suppose that on a particular statistics exam the students were separated into two groups, the group that studied and the other group that had not studied. Data was collected and a 95% confidence interval for the difference in the proportion of those passing the exam from the group that studied and the proportion of those passing the exam from the group that had not studied. The confidence interval turned out to be (-0.005,0.125). Note that sample 1 is from the group that studied and sample 2 is from the group that did not study. Select the best answer.
Choose one answer.

A. The data fails to show with 95% confidence that these questions discriminated between those who studied and those who did not study.
B. We are 95% confident that those who studied had a higher passing rate than those who did not study.
C. We are 95% confident that those who studied had a lower passing rate than those who did not study.
D. None of the these are correct.
Mathematics
1 answer:
avanturin [10]3 years ago
4 0

Answer:

D. None of the these are correct.

Step-by-step explanation:

Hello!

The students of a statistic class were separated in two groups for an exam (those who studied - groups 1- and those who didn't study- group 2-) after the exam the proportions of students that passed in both groups were calculated and a 95% CI for the difference of proportions was obtained: (-0.005,0.125)

If the parameter estimated was p₁ - p₂

If the questions discriminated between the students that studied and the students that did not study, then the proportions of both groups should be different, then the hypotheses are:

H₀: p₁ - p₂=0

H₁: p₁ - p₂≠0

To use a CI to decide over a hypotheses pair several conditions should be met:

1) The hypothesis should be two.tailed.

2) Both the hypothesis and the interval should study the same parameter.

3) The confidence level and significance level should be complementary, meaning if the interval was constructed with 1 - α: 0.95 then the test should be made with a level of α: 0.05.

If the conditions are met, then you can decide using the following rule:

If the CI contains the value stated in the null hypothesis, the decision is to not reject the null hypothesis.

If the CI doesn't contain the value stated in the null hypothesis, then the decision is to reject the null hypothesis.

Since "zero" is contained by the given interval, the decision is to not reject the null hypothesis. The at 5% confidence level you can conclude that the questions didn't discriminate between the students that studied and the students that didn't study.

I hope it helps!

You might be interested in
Jack wants to fill a rectangular box with sand. The length of the sand box is 3 feet, width is 6 inches, and height is 2.4 inche
Aleksandr-060686 [28]
Jack would need to buy 2 bags of sand.
To find the answer you first have to find the volume of the rectangular box which can be found using the formula length times width times height (remember that the numbers have to have the same unit so it would look like 3 times .5 times .2 if you convert them all the feet). the volume of the box is equal to .3
Then you could set the volume of the box equal to .15x to find how many boxes he would need. The formula would be .15x=.3
Divide by .15 to get x alone and you get 2 for the answer.
3 0
3 years ago
Read 2 more answers
(7y is supposed to be 7x)
Andrei [34K]

Answer:

Step-by-step explanation:

Angle E is (7x+27) because it is corresponding.

So, 7x+27+15x-5=180 (angle on a straight line is 180 degrees

22x+22=180

22x=158

x= 158/22 = 7.18'

7 0
2 years ago
This si more tiring than actually doing the work
DENIUS [597]

Answer:

D(WZ║XY)

Step-by-step explanation:

The definition of a trapezoid is "a quadrilateral with only one pair of parallel sides".  WX and ZY are obviously not parrelel, so you need WZ and XY to be parellel to follow the criteria of a trapezoid.

6 0
2 years ago
A Truck weighs 3 tons how many pounds does it weigh?
Monica [59]

Answer:

6000 pounds

Step-by-step explanation:

5 0
2 years ago
Meg plotted the graph below to show the relationship between the temperature of her city and the number of sweaters sold at a st
Sav [38]

The explanation about the graph is illustrated below.

<h3>How to illustrate the graph?</h3>

The graph shows 0 to 30 on the x-axis at increments of 5 and 0 to 12 on the y-axis at increments of 1. The label on the x-axis is Temperature in degrees C, and the label on the y axis is the Number of Sweaters Sold.

If you will draw lines through, (12.5,6) and (15,4), it will best represent a line of best fit, because most of the points on the same and opposite sides of line are equidistant from each other.

Equation of line passing through (12.5,6) and (15,4) A line of best is the line that passes through all or some points or only through a single point, which describes the relationship between x and y values of data set

4x + 5y = 80

5y = -4x + 80.

y = -4x/5 + 16

Slope = -4/5 and y intercept is 16.

Learn more about graph on:

brainly.com/question/9352287

#SPJ1

3 0
2 years ago
Other questions:
  • Can anyone explain how to do this?
    8·1 answer
  • Find the area of the triangle that has a base of 16 yd and a height of 9 yd.
    9·1 answer
  • in june , a camp has 325 campers and 26 counselors, in july,265 campers leave and 215 new campersarrive.How many counselors does
    9·1 answer
  • Round 18.194 to the place named
    8·1 answer
  • How do you rearrange the formula for the variable indicated:
    8·1 answer
  • A concession stand at a baseball game sells 3 apples for $2.00.How can you find the cost for 10 apples?
    7·2 answers
  • I need this down thanks
    6·2 answers
  • 6th grade math !!!!!!!!!!!
    10·2 answers
  • Free Branliest<br> Answer please I LONELY PLS GUYS PLEASE
    11·2 answers
  • A car travels a certain distance at x km/h in 12 hours. If it travels of the way at km/h and the rest at 4x km/h, how many hours
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!