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ira [324]
4 years ago
8

Find the sample size necessary in order to be 95% confident when determining the true mean weight within 2 units (EC2). Assume t

hat sample variance is 44. a. 65 b. 157 c. 43 d. 170 e. 89
Mathematics
1 answer:
bogdanovich [222]4 years ago
8 0

Answer:

(c) 43.

Step-by-step explanation:

Given:

Margin of error (E) = 2

Sample variance (s^{2}) = 44

Confidence level = 95%

The z- value at 95% confidence level is 1.96.

The sample using the provided information can be calculated as:

n=(\frac{z(s)}{E})^{2} \\n=\frac{z^{2} s^{2} }{E^{2} } \\n=\frac{1.96^{2} (44) }{2^{2} }\\n= 42.52\\n=43

Hence, the correct option is (c) 43.

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P^2 - 4p - 32 / p + 4, simplify the rational expression. state any restrictions
dusya [7]

Answer:

The correct answer is: p - 8 ∧ restriction p ≠ -4

Step-by-step explanation:

(p² - 4 p - 32) / ( p + 4)

The existence of this rational algebraic expression is possible only if it is:

p + 4 ≠ 0  => Restriction is p ≠ -4

(p² - 4 p - 32) / ( p + 4) = (p² - 8 p + 4 p - 32) / (p + 4) =

= (p (p -8) + 4 (p -8)) / (p + 4)= (p - 8) (p + 4) / ( p +4) = p - 8

God with you!!!

7 0
4 years ago
Read 2 more answers
Help I really need the answers to these by tomorrow morning.
Damm [24]

Answer(s):

31:

4.5 = 4 + 1/2 (0.5)

32:

23.7 = 20 + 3 + 7/10 (0.7)

33:

6.9 = 6 + 0.9

34:

35.4 = 30 + 5 + 0.4

it's kinda implied :)

Good Luck Dude.

7 0
4 years ago
which of the following can not be probabilities? 1, -0.56, square root of 2, 3/5, 1.23, 0, 5/3, 0.02??
Katarina [22]

It is important to know that probabilities are defined insed the range [0,1], which means they cannot be outside that set of values.

<h2>Hence, -0.56, square root of 2, 1.23, and 5/3 can't be probabilities because they are outside the range of values.</h2>
3 0
1 year ago
Tammy is 8 years older than mike. jane is twice as old as mike. the sum of there ages is 52
docker41 [41]

Answer:

Hey Xzavier! You're in my class!! Probably shouldn't use your real name on a cheating website... I mean ya... it's funny as hell and gave me a REALLY great laugh but our teachers know websites like these exist and by using your real name you're going to get caught eventually. I'm not a rat and I won't tell Mrs. Furnia but for future reference, use a screen name...

Step-by-step explanation:

7 0
3 years ago
Hi I did 1st 2 but need help with rest simplifying these and I need them explained step by step plz and thank you
Anna007 [38]

Hey there ! Heres your answer :)

4 0
3 years ago
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