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3 years ago

Cheryl writes 7 fewer posts than Kevin on a social media site.

Mathematics

1 answer:

Lostsunrise [7]3 years ago

5 0

Answer:

She wrote 14 points

Step-by-step explanation:

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3. The following data was collected from a simple random sample from a process (an infinite population). 13 15 14 16 12 a. The p

SVETLANKA909090 [29]

Answer:

Step-by-step explanation:

Given the data:

13 15 14 16 12

The point estimate of the population mean will be :

ΣX/ n

X = Given data points

N = sample size

ΣX = (13 + 15 + 14 + 16 + 12) = 70

N = 5

Hence,

ΣX/ N = 70 / 5

Point estimate of population mean = 14

3 0

3 years ago

5 times 3 and 5 over 8 times 9 and 1 over 4

Ber [7]

The answer should be:
20.875

Hope this helps.

3 0

3 years ago

Read 2 more answers

A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 3%

andre [41]

Answer: a) 683 b) 1067

Step-by-step explanation:

The confidence interval for population proportion is given by :-

$p\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}$

a) Given : Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}}=\pm1.96$

Margin of error : $E=0.03$

Formula to calculate the sample size needed for interval estimate of population proportion :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.2(0.8)(\dfrac{1.96}{0.03})^2=682.951111111\approx683$

Hence, the required sample size would be 683 .

b) If no estimate of the sample proportion is available then the formula to calculate sample size will be :-

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.25(\dfrac{1.96}{0.03})^2=1067.11111111\approx1067$

Hence, the required sample size would be 1067 .

3 0

3 years ago

5. What is the total surface area of the figure below? 6 cm 7 cm 13.1 cm

zhannawk [14.2K]

Answer:

550.2cm

Step-by-step explanation:

6 cm x 7 cm x 13.1 cm = 550.2 cm

8 0

3 years ago

Ten out of every 32 people

SVETLANKA909090 [29]

Answer: 0.3125% play among us

Step-by-step explanation:

If you take the number of people who play among us (10) and divide it by the number of people surveyed (32)

10/32

You will get 0.3125%

4 0

3 years ago

Read 2 more answers