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tresset_1 [31]
3 years ago
8

A sample of male and female smartphone users were asked to name their favorite type of app from the list below.

Mathematics
1 answer:
Leni [432]3 years ago
4 0

Answer:

males like sports better

females like cooking apps better

females like shopping apps better

males like gaming apps better

1,555‬ females where asked this question

1,555 males where asked this question

3,110 people in all where asked this question

Step-by-step explanation:

hope this helps! brainlist pls?

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A random sample of 20 items is selected from a population. When computing a confidence interval for the population mean, what nu
kumpel [21]

Answer:

For this case since the sample size is lower than 30 , n =20<30, is not appropiate use the normal standard distribution to calculate the confidence interval for the mean, and then for this case is better use the t distribution since takes in count the correction factor to approximate the distribution of the true parameter.

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Solution to the problem

For this case since the sample size is lower than 30 , n =20<30, is not appropiate use the normal standard distribution to calculate the confidence interval for the mean, and then for this case is better use the t distribution since takes in count the correction factor to approximate the distribution of the true parameter.

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

8 0
3 years ago
Find the equation of a line that contains the points (6,3) and (6,−2).
RSB [31]

Answer:

x  = 6

Step-by-step explanation:

First find the gradient,

Gradient = \frac{y2-y1}{x2-x1} = \frac{-2-3}{6-6} =\frac{-5}{0} =0

Since this line has no gradient, it means that it's a horizontal or vertical line. We cannot substitute in the values because the gradient is 0 so this line will only be x = 6

3 0
3 years ago
Read 2 more answers
The expression x-3 is a factor of the polynomial P(X)=x^3-4x^2+4x-3. use synthetic division to write P(X) in factored form.
Serga [27]
I’m not sure on the answer choices but this is what I got when I did synthetic division.

8 0
3 years ago
Read 2 more answers
What is the measure of VKW?
MrRissso [65]

Answer:

107

Step-by-step explanation:

5x + 3 + 7x + 9 = 180

12x + 12 = 180

12x = 168

x = 14

7(14) + 9 = 107

6 0
2 years ago
In.<br>7.a. Evaluate.<br>(1) (8-2 x 124) ÷27<br>​
Korvikt [17]

Answer:

-8.88888888889.............

8 0
3 years ago
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