Answer: d. if we do not know the population standard deviation and must use the sample standard deviation.
Step-by-step explanation:
We use t-distribution is quite similar to distribution of z-score .
The interpretation of t-scores and z-scores are same.
T- distribution is used when the data is not accurately normal and when the population standard deviation is unknown.
In the absence of population standard deviation , we use the standard deviation of the sample.
So , We use a t distribution for inference about a population mean instead of the standard Normal distribution if we do not know the population standard deviation and must use the sample standard deviation.
Hence, the correct option is : d. if we do not know the population standard deviation and must use the sample standard deviation.
Answer:
4D -4 is 1 ( d-minus 1 )
Step-by-step explanation:
the distance in feet that Karina swims in a race is represented by 4D - 4 where D is the distance for each lap.
to get equivalent expression we Factor the expression 4 d - 4
factor out for from the expression 4 d - 4 when we Factor at 4 we divide each term by 4.
4d -4
4(d-1)
the equivalent expression for for the -4 is 4 ( d - 1)
Answer:
Find five rational numbers between 2/3 and 4/5 -
61/90 62/90 63/90 64/90 65/90 66/90 67/90
choose any five :)
Answer:
I'll talk to you!
Step-by-step explanation:
The dot plot that corresponds to the given data is the second dot plot
The frequency and the percent frequency distribution are shown below
<h3>
Frequency distribution</h3>
The given data is
5.6 9.9 11.3 7.5 10.0 11.9 13.2 13.8 10.0 11.9
6.5 9.0 11.2 10.9 14.6 7.2 10.0 6.0 15.8 11.3
From the question, we are to construct a dot plot
Among the given options, the dot plot that corresponds to the given data is the second dot plot
b) We are to construct a frequency distribution
The frequency distribution table is shown below
Class Frequency
6.0 - 7.9 4
8.0 - 9.9 2
10.0 - 11.9 9
12.0 - 13.9 2
14.0 - 15.9 2
Total 19
b) We are to construct a percent frequency distribution
The percent frequency distribution table is shown below
Class Percent Frequency
6.0 - 7.9 21.1%
8.0 - 9.9 10.5%
10.0 - 11.9 47.4%
12.0 - 13.9 10.5%
14.0 - 15.9 10.5%
Total 100%
The frequency and the percent frequency distribution are shown above
Learn more on Frequency distribution here: brainly.com/question/1094036
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