Please help! Will mark brainlessest

"the distribution of means is the correct comparison distribution when"

alexandr402 [8]

The distribution of means is the correct comparison distribution when

Answer: The distribution of means is the correct comparison distribution when there is more than one person in a sample.

The distribution of the sample means is also called the sampling distribution of mean. It is most appropriate when we take a random sample of size n from the population of size N. The distribution of the sample means will follow normal distribution with mean = $\mu$ and standard deviation = $\frac{\sigma}{\sqrt{n}}$

4 0

3 years ago

A survey asked, "How many tattoos do you currently have on your body?" Of the 1221 males surveyed, 193 responded that they ha

mote1985 [20]

Answer:

Step-by-step explanation:

Given that a survey asked, "How many tattoos do you currently have on your body?" Of the 1221 males surveyed, 193 responded that they had at least one tattoo. Of the 1005 females surveyed, 130 responded that they had at least one tattoo.

$H_0:p_1 = p_2\\H_a: p_1 \neq p_2$

(two tailed test at 1% significance level)

Difference in proportions = $\frac{193}{1221} -\frac{130}{1005} \\=0.029$

Standard error for difference in proportions = 0.0150

Margin of error = 2.58*std error

= 0.0387

99% confidence interval =

$(0.029-0.0387, 0.029+0.0387)\\=(-0.0097, 0.0677)$

Since this confidence interval contains 0 for difference in proporiton we can say that H0 is true.

We are 99% confidence that for samples randomly drawn for large sizes, the males and females have approximately the same proportion.

3 0

3 years ago

If your heart beats 80 times per minute and you live to be 90 years old, estimate the number of times your heart beats during yo

umka2103 [35]

The heart beat is given in units of beats per minute, therefore before we can do any calculations let us make sure that all units are similar by converting the age in terms of minutes.

We know that there are 365 days per year, therefore:

90 years (365 days / year) = 32,850 days

We know that in a day, there are 24 hours, therefore:

32,850 days (24 hours / day) = 788,400 hours

And in an hour, there are 60 minutes, therefore:

788,400 hours (60 minutes / hour) = 47,304,000 minutes

Now calculating for the total heart beats in a lifetime:

total heartbeats = (80 beats / minute) * 47,304,000 minutes

total heartbeats = 3,784,320,000

Writing this into scientific notation:

3.78 x 10^9 beats

or

<span>3.8 x 10^9 beats</span>

8 0

3 years ago

The distance on a map between two locations is

Natalka [10]

Answer:

54 miles

Step-by-step explanation:

lets work in steps here:

1 in (24 miles) + 1 in (24 miles) = 2 in OR 48 miles

PLUS

**0.25 in (6 miles)

= 48+6 miles = 54 miles

** you know that 0.25=6 miles because 24/6 is 4. 100/4 is 0.25. simple division.

5 0

3 years ago

Read 2 more answers

HELP PLZZ!!! I'LL GIVE BRAINYLEST!!!!!!! I BEEGG YOUU!!!! ANY THING!! PLZ GET THIS RIGHT!!!! 10 POINTS!!!!!!

lubasha [3.4K]

Answer:

A. 2x to the power of 3 plus x to the power of 2 plus x plus 1

Step-by-step explanation:

$2x^3+x^2+x+1$

4 0

3 years ago

Read 2 more answers