The confidence interval is from 9.81 to 10.19.
We first find the mean of the data:
<span>(9.8+10.2+10.4+9.8+10.0+10.2+9.6)/7 = 10
Next we find the standard deviation:
</span>σ=√([<span>(9.8-10)^2+(10.2-10)^2+(10.4-10)^2+(9.8-10)^2+(10-10)^2+(10.2-10)^2+(9.6-10)^2]/7) = 0.262
The z-score for 95% confidence is found by
1-0.95 = 0.05; 0.05/2 = 0.025; from the z-table, it is 1.96.
The confidence interval is calculated using
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No, there is significant difference in the use of e readers by different age groups.
Given sample 1 ( 29 years old) 
=628, 
=7%, sample 2( 30 years old)
=2309, 
=0.11.
We have to first form hypothesis one null hypothesis and other alternate hypothesis.
π1-π2=0
π1-π2≠0
α=0.05
Difference between proportions 
The pooled proportion needed to calculate standard error is:
=(44+254)/(628+2309)
=0.10146
The estimated standard error of difference between means is computed using the formula:
=
=
=
=0.01315
Z= Pd-(π1-π2)/
=-0.04-0/0.013
=-3.0769
This test is a two tailed test so the p value for this test is calculated as (using z table)
p value:2 P(Z<-3.0769)
=2*0.002092
=0.004189
P value< significance level of 5%.
Hence there is enough evidence to show the claim that there is a significant difference in the use of e readers by different age groups.
Learn more about hypothesis at brainly.com/question/11555274
#SPJ4
Question is incomplete as it also includes:
Significance level of 5%.
Answer: E. 150 square units.
Step-by-step explanation:A polygon is figure with at least 3 straight or definite sides or typically 5 or more straight sides.
Here the polygon we are given is a rectangle.
We know that,
Area of a rectangle = l x w
so we need to measure the length and width of the rectangle to find its area.
If we look closely, we can see the length of the rectangle above the x-axis is 8 units and the length below the x-axis 7 units which makes a total og 15 units.
Answer:
Step-by-step explanation:
Lets write an equation for this :)
So, the sum of -3 times a number and 0.3
This would be : -3x +0.3
Is at most, 6.3
so, it is equal to, or less than 6.3
-3x +0.3 <u><</u> 6.3
Now lets solve!
x<u>> </u>-2
the number is greater than or equal to -2
<span>C: 3x + 2y = 6
7x =12
Tell me if this helps, Have a great day!</span>
