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Gnesinka [82]
3 years ago
11

It is known that the population variance is 144. At 95% confidence, what sample size?a. 22.b. 23.c. 24.d. 25.e. none of the abov

e.
Mathematics
1 answer:
romanna [79]3 years ago
3 0

Answer:

(E) None of the above

Step-by-step explanation:

The statistic provided is that of the population but the statistic you seek is that of the sample.

Looking at the statistic itself, Variance is the square of Standard Deviation or standard deviation is the square root of variance.

Hence you calculate the standard deviation of the population mean:

√144 = 12

The population standard deviation of/from the mean value is 12.

It could be possible to decipher the sample mean from population mean but not sample size.

So, you can't pick just any answer. Population size should be given first.

You might be interested in
A movie theater runs a special promotion where each person pays $10 for an all-day ticket and $2 for each item at the concession
Naddik [55]

Answer:

Each person pays $12.

Step-by-step explanation:

$10 + $2 = $12

4 0
3 years ago
Jose asks his friends to guess the higher of two grades he received on his math tests. He gives them two hints. The difference o
denis23 [38]

Option D. 96 is the correct answer.

Explanation:

Let the higher grade be = x

Let the lower grade be = y

As given, The difference of the two grades is 16

x-y=16 or x=16+y   .... (1)

The sum of one-eighth of the higher grade and one-half of the lower grade is 52.

\frac{1x}{8}+\frac{1y}{2}=52   ... (2)

Putting the value of x=16+y in equation (2)

\frac{16+y}{8}+\frac{y}{2}=52

\frac{16+y+4y}{8}=52

\frac{16+5y}{8}=52

16+5y=416

5y=400

y=80

As x=16+y

x=16+80 = 96

Hence, higher grade is 96.


8 0
3 years ago
Please help me with 5-7
mixer [17]
2y+12 < 42

subtract 12 from both sides to isolate the 'y'

2y<30

since '2y' is multiplication, the opposite is division. divide by 2 to isolate the 'y'. doing so will flip the < sign to make it >.

y > 15

------------------------------------------------

She makes $15 an hour. Her employers take out $125 weekly. She gets a paycheck for $205 that week.

Add the $125 back in that her employer took out and you can find how much she earned that week, it's $330. Divide $330 by $15 to find that she worked a minimum of 22 hours that week.

15h-125=205

15h=330

h=22

plug 22 in to the equation 15h-125=205 to check your answer
------------------------------------------

I can't help you with the last one. Best of luck though man and god bless.


8 0
3 years ago
Simplify The square root of 5 (6-4 the square root of 3)
pantera1 [17]

Answer:

7.75

Step-by-step explanation:

6-4=2

2 times the square root of 3=3.46410161514

square root of 5 times 3.46410161514=7.74596669242

to 2dp=7.75

8 0
3 years ago
For each sequence find the first 4 term and the 10th term.
Fittoniya [83]

Answer:

where is the sequence?

#carryinlearning

5 0
3 years ago
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