Answer:
<h3>In an independent groups experiment, if we must estimate the population standard deviation to determine the significance of the sample results, the appropriate inference test is the<u> t test</u></h3>
Step-by-step explanation:
In an independent groups experiment, if we must estimate the population standard deviation to determine the significance of the sample results, the appropriate inference test is the<u> </u><u>t test</u>
<h3>For :</h3>
- A t-test is one of the methods of a statistic and is used to determine if there is a significant difference between the two groups of their means based on a sample in data.
- The statistical significance is determined by the difference between the averages of group size , the sample size, and standard deviations of the groups.
<h3>Therefore option c) t test is correct</h3>
Answer:
D
Step-by-step explanation:
I think that it would be d
Using weighted mean, the mean is determined by
![\begin{gathered} \overline{x}=\frac{\sum w_ix_i}{w_i} \\ \text{where} \\ x_i\text{ are the data set} \\ w_i\text{ is the weight, or the frequency} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Coverline%7Bx%7D%3D%5Cfrac%7B%5Csum%20w_ix_i%7D%7Bw_i%7D%20%5C%5C%20%5Ctext%7Bwhere%7D%20%5C%5C%20x_i%5Ctext%7B%20are%20the%20data%20set%7D%20%5C%5C%20w_i%5Ctext%7B%20is%20the%20weight%2C%20or%20the%20frequency%7D%20%5Cend%7Bgathered%7D)
![\begin{gathered} \overline{x}=\frac{\sum w_ix_i}{w_i} \\ \overline{x}=\frac{1\cdot0+1\cdot10+2\cdot24+3\cdot21+4\cdot16+5\cdot9+6\cdot1}{1+10+24+21+16+9+1} \\ \overline{x}=\frac{0+10+48+63+64+45+6}{82} \\ \overline{x}=\frac{236}{82} \\ \overline{x}=2.87804878 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Coverline%7Bx%7D%3D%5Cfrac%7B%5Csum%20w_ix_i%7D%7Bw_i%7D%20%5C%5C%20%5Coverline%7Bx%7D%3D%5Cfrac%7B1%5Ccdot0%2B1%5Ccdot10%2B2%5Ccdot24%2B3%5Ccdot21%2B4%5Ccdot16%2B5%5Ccdot9%2B6%5Ccdot1%7D%7B1%2B10%2B24%2B21%2B16%2B9%2B1%7D%20%5C%5C%20%5Coverline%7Bx%7D%3D%5Cfrac%7B0%2B10%2B48%2B63%2B64%2B45%2B6%7D%7B82%7D%20%5C%5C%20%5Coverline%7Bx%7D%3D%5Cfrac%7B236%7D%7B82%7D%20%5C%5C%20%5Coverline%7Bx%7D%3D2.87804878%20%5Cend%7Bgathered%7D)
Rounding off to one decimal place, the mean number of TVs owned is 2.9.
Answer:
d
Step-by-step explanation:
y=tan (2(x+2)-2, I think that is it
Answer:
D
Step-by-step explanation:
A function is valid if each x input has a different y counterpart
In picture D both 3 and 5 repeat --> (3,2)(2,6) and (5,6)(5,8)
This would create an undefined line that would fail the vertical line test (multiple x values on one y value)