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Aleks [24]
3 years ago
14

A survey of 225 students showed the mean number of hours spent studying per week was 20.6 and the standard deviations was 2.7

Mathematics
2 answers:
Step2247 [10]3 years ago
6 0

Answer:

.3 is the answer.

Step-by-step explanation:

LekaFEV [45]3 years ago
5 0

Answer:

The margin of error is approximately 0.3

Step-by-step explanation:

The following information has been provided;

The sample size, n =225 students

The sample mean number of hours spent studying per week = 20.6

The standard deviation = 2.7

The question requires us to determine the margin of error that would be associated with a 90% confidence level. In constructing confidence intervals of the population mean, the margin of error is defined as;

The product of the associated z-score and the standard error of the sample mean. The standard error of the sample mean is calculated as;

\frac{sigma}{\sqrt{n} }

where sigma is the standard deviation and n the sample size. The z-score associated with a 90% confidence level, from the given table, is 1.645.

The margin of error is thus;

1.645*\frac{2.7}{\sqrt{225}}=0.2961

Therefore, the margin of error is approximately 0.3

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Please help me I don’t understand this!
dalvyx [7]

Okay, I'm going to assume that the part you're confused about is the part about how to use the number line to get the answer since the answer is given to you (it's -3).

So what you want to do is plot a point on -7. Since the line ends at -5, extend the line by drawing 2 vertical lines about to represent -6 and -7 (if you're reading it from left to right the -7 would come before -6 because it is a smaller value). Then you would want to hop 4 lines to the right, starting on -7. You would land on -3 which is the answer.

5 0
3 years ago
The table below represents a linear function f(x) and the equation represents a function g(x):
AysviL [449]

Answer:

(A)

Slope for f(x) is 3

Slope for g(x) is 4

(B)

So, y-intercept for f(x) is greater

Step-by-step explanation:

(A)

Slope of f(x):

we can select any two points

(-1,-6)

so, x1=-1 and y1=-6

(0,-3)

so, x2=0 , y2=-3

now, we can use slope formula

m=\frac{y_2-y_1}{x_2-x_1}

now, we can plug values

m=\frac{-3+6}{0+1}

m=3

Slope of g(x):

we can compare with

y=mx+b

g(x)=4x-5

so, m=4

so, slope is 4

(B)

For f(x):

we can select point as

x=0 , y=-3

so, y-intercept is -3

For g(x):

g(x)=4x-5

we can compare with

y=mx+b

where

b is y-intercept

we get

b=-5

we know that -3 is greater than -5

So, y-intercept for f(x) is greater

5 0
3 years ago
Please help I dont have that much time left❤
Sladkaya [172]

Answer:

b= 75

Step-by-step explanation:

8 0
3 years ago
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BabaBlast [244]

Answer:

A is

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Step-by-step explanation:

Because it is the right answer

8 0
3 years ago
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babunello [35]
I think it is D but if it is not I’m sorry
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3 years ago
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