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
Setler [38]
2 years ago
12

A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standa

rd deviation were calculated. Based on the results, the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 5% of 75%.
Is the confidence interval at 90%, 95%, or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation.

Will Mark Branliest, Please Help ASAP
Mathematics
1 answer:
givi [52]2 years ago
7 0

Answer:

i)

The confidence interval is at 90%

ii)

The margin of error is 5%

iii)

The 90% confidence interval is (70%, 80%)

iv)

We are 90% confident that the average score of seniors in the field test is between 70% and 80%.

Step-by-step explanation:

i)

The confidence interval is at 90%

We are informed that the exam creator claims that on this particular exam, nine times out of ten, seniors will have an average score within 5% of 75%. This implies that we are 9 times out of 10 confident that seniors will have an average score within 5% of 75%.

The level of confidence is thus;

(9/10)*100 = 90%

ii)

The margin of error is 5% or equivalently 0.05

We are informed that the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 5% of 75%.

Since the average score is within 5%, the margin of error is 5%

iii)

A confidence interval is calculated using the formula;

point estimate ± margin of error

Our point estimate is 75%

Our margin of error is 5%

The 90% confidence interval is thus;

75% ± 5% = (70%, 80%)

iv)

The 90% confidence interval is interpreted as;

We are 90% confident that the average score of seniors in the field test is between 70% and 80%.

This is a confidence interval for the mean, the level of confidence is 90% and our confidence interval is (70%, 80%).

You might be interested in
2 Points
cupoosta [38]

Answer:

Looking at the graphic, it seems that B is true.

Exterior Angles BCD and BCA form a linear pair and add to 180 degrees.

Step-by-step explanation:

3 0
3 years ago
Jessie works as a salesman. He earns a daily wage of 250 pesos and an additional
Darina [25.2K]

Answer:

y = 250 + \frac{10x}{3}

Step-by-step explanation:

Given

Daily\ Wages = 250

Additional = 10 for every 3

Required

Determine the function that represents Jessie's daily earnings:

From the question, we have that:

y = earnings

x = phones

If for 3 phones, he gets 10.

i.e.:

3 pieces = 10

then

1\ pieces = \frac{10}{3} ----- By dividing both sides by 3

and

x\ pieces = \frac{10x}{3} ----- By multiplying both sides by x

The above expression represents the additional earnings for x phones

So, daily earnings y is calculated as :

y = Daily\ Wages + Additional\ Earnings

y = 250 + \frac{10x}{3}

3 0
2 years ago
At the 2005 World Exposition in Aichi, Japan, tiny mu-chips were embedded in the admissions tickets to prevent counterfeiting. T
frutty [35]

Answer:

Step-by-step explanation:

The solution is in the attachment

5 0
3 years ago
Simplify the expression using the laws of exponents
djyliett [7]
The answer would be D
this is because negative exponents end up going on the other side of the fraction. additionally, the 36 and 15 can be simplified by dividing them both by 3
4 0
3 years ago
Place value of 3 in 5678.321
gregori [183]
The place value of 3, is Tenths.

5 0
3 years ago
Read 2 more answers
Other questions:
  • The quantity demanded x for a certain brand of MP3 players is 100 units when the unit price p is set at $80. The quantity demand
    12·1 answer
  • What is the value of fraction 1 over 2x3 + 5.2y when x = 2 and y = 3?
    15·1 answer
  • Nancy's spaghetti and meatballs recipe calls for 2 cloves of garlic the recipe makes 8 servings how much garlic is in each servi
    9·1 answer
  • 1.) 9x + 2x - 5x + 7 - 6
    8·2 answers
  • The equation y=1/9x relates proportional quantities x and y.
    12·1 answer
  • List below are the speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, CA. Use the sample data to construct
    11·1 answer
  • Pls help!!! this is urgent!!
    10·1 answer
  • Two friends, Caleb and Ynez are both selling brownies for a class fundraiser. They decide to advertise how much buying a certain
    5·1 answer
  • Sin Z = <br><br> Cos Z = <br><br> Tan Z =
    14·1 answer
  • (d). Use an appropriate technique to find the derivative of the following functions:
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!