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Korvikt [17]
3 years ago
10

A researcher initially plans to take an SRS of size 160 from a certain population and calculate the sample mean. Later, the rese

archer decides to increase the sample size so that the standard deviation of the sampling distribution of will be half as big as when using a sample size of 160.
What sample size should the researcher use?
Mathematics
1 answer:
lara [203]3 years ago
3 0

Answer:

640

Step-by-step explanation:

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I WILL MARK BRAINLIEST
vagabundo [1.1K]

Answer:

\frac{81}{m^7}

Step-by-step explanation:

We have a certain expression and are asked to find its equivalent with the answers provided :

(3m^{-4} )^3(3m^5)

Remove the parenthesis around 3m^5 :

(3m^{-4} )^3*3m^5

Do the exponent rule for outside and inside exponent parenthesis :

(3m^{-4*3} )

3^3m^{-12} *3m^5

Apply addition exponent rule :

m^{-12} *3^{3+1} m^5

Add :

m^{-12} *3^4m^5

Apply the addition rule for -12 + 5 :

3^{4} m^{-7}

Apply negative exponent rule for m^-7 :

3^4*\frac{1}{m^7}

Multiply the fractions :

\frac{1*3^4}{m^7}

\frac{81}{m^7}

3 0
3 years ago
How many solutions can the equation 6x = 48 have?
ziro4ka [17]
Only one. 8

Divide by 6 on both sides. x = 8. That's it.
7 0
3 years ago
Wes wants to buy 3 pepper plants from the garden center. The regular price of a pepper plant
Nataly_w [17]
The sale price of 3 pepper plants after a 20% discount is $3

The regular price of one pepper plant is $5 if Wes wants to buy 3 pepper plants 5x3 is 15 and since he can use a 20% off coupon on the pepper plants. 20% of 15 is 3 meaning the sale price for 3 pepper plants after using the 20% discount coupon is $3.
6 0
3 years ago
Read 2 more answers
Use the table to answer the question.
Over [174]

Answer:

in the survey, 16 out of 80 students who where asked favored chicken nuggets.

so we need to calculate like this:

530 * 16/80

=530 * 1/5

=530/5

=106

hope this helps your understanding, wish you good grades

3 0
3 years ago
B. A number y minus 75.​
mel-nik [20]

Step-by-step explanation:

y-75

3 0
3 years ago
Read 2 more answers
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