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Vitek1552 [10]
3 years ago
8

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.
Mathematics
1 answer:
tigry1 [53]3 years ago
6 0

Answer:

the confidence interval is 90 % 0.05 < p < 0.75

and margin of error is 35 %

Step-by-step explanation:

Since 9 out of 10 students is 90 % so the confidence interval is 90 %

Range of Confidence Interval = 2* ME where ME = Margin of Error

0.75 - 0.05 = 2* ME

0.7 = 2 * ME

0.7 / 2 = ME

0.35 = ME or

ME = 35 %

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Softa [21]

Answer:

a)- Given that a student is a 10th grader, there is a 14% chance he or she has a job.

Step-by-step explanation:

Option (a) is correct here because Relative frequency means the probability of occurrence or number of time-specific event occurs to the total event.

Option (b) is not correct because We already know that student is in 10th or 11th grade, after that we get to know about 14% chance.

Option (c) & (d) are clearly not possible.

5 0
3 years ago
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A culture of 3,000 bacteria quadruples in number every 10 hours. Plt) represents the
Levart [38]

Answer:

P(t) = 3000 * 4^(t/10)

Step-by-step explanation:

There is more than one way to get an exponential function out of the information given.  The way the question is worded, however, seems to suggest the following type of answer:

One general form of the exponential function is y = a·bx, where a is the initial value, and b is the growth or decay factor.  So right away we can say that a = 2300.

Now for the growth factor.  When something is increasing or decreasing by a certain percentage, we are adding or subtracting that percentage to the 100% (which is equal to 1) that exists currently.  So here we're increasing by 11%, or 0.11.  Then the growth factor b is (1 + 0.11), or 1.11.

4 0
3 years ago
A price for pineapples is $5 for two pineapples the price for pineapple is $8 for four pineapples which store is offering the lo
Butoxors [25]

Answer:

The first store

Step-by-step explanation:

Given data

Let us find the unit cost on each sale

A price for pineapples is $5 for two pineapples

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price for pineapple is $8 for four pineapples

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6 0
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A

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8 divided by 9 = .8 repeated

To turn it into a percent, you move the decimal to the right 2 spaces.

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88.8 repeated rounds to 88.89.

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3 years ago
One-step equations: integers 18=a/2
denpristay [2]

Answer:

36

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18=a/2

2*18=a

36=a

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