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You have the following observations: 7,7,7. What is the standard deviation?

A company producing Mars Bar will likely use which form of sampling to check the quality?

Review of Statistics

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Answers

1
A company producing Mars Bar will likely use which form of sampling to check the quality?
Stratified
Systematic
Random
Holistic
2
You have the following observations: 7,7,7. What is the standard deviation?
7
21
0
1
3
How can we see if our data is normally distributed?
By plotting all observations on a graph
There are only 2 possible answers to the questions asked in the sample
By seeing if the mean average is equal to the median average
By checking if we have more than 30 observations
4
To test the slope of a regression line, we can use what statistic?
Margin of error
R-squared value
Correlation coefficient
P-value
5
The standard deviation is the deviation from what?
The mean average
The confidence interval
The lowest and highest observation
The regression line
6
In a standardized normal distribution, the mean will always be
-1
The same as the sample mean
1
0
7
In regression analysis, the X variable is always
Greater than the Y variable
On the vertical axis
Dependent on the Y variable
On the horizontal axis
8
The null hypothesis represents what?
A statement which you want to be able to reject
A statement of fact
A statement to test the R-squired statistic
A statement which is never true
9
What is your confidence level if the significance alpha is set at 10%
5%
10%
95%
90%
10
The R-squared statistic tells us what?
The correlation between 2 variables
The level of significance
How much Y explains X
How much X explains Y