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Delia Auer

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12y ago

If it is a discrete variable, then 31 - 25 = 6

If it is continuous then 31.5 - 24.5 = 7

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Q: How can you find size of class interval 25-31?
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What is class interval size?

The class interval for each interval is the difference between its upper limit and its lower limit.


What is the sum of the product of the frequencies and the square of the class marks (ΣfX²60,55,40,48,52,36,50?

Step 1: Find the midpoint of each interval. Step 2: Multiply the frequency of each interval by its mid-point. Step 3: Get the sum of all the frequencies (f) and the sum of all the fx. Divide 'sum of fx' by 'sum of f ' to get the mean. Determine the class boundaries by subtracting 0.5 from the lower class limit and by adding 0.5 to the upper class limit. Draw a tally mark next to each class for each value that is contained within that class. Count the tally marks to determine the frequency of each class. What is this? The class interval is the difference between the upper class limit and the lower class limit. For example, the size of the class interval for the first class is 30 – 21 = 9. Similarly, the size of the class interval for the second class is 40 – 31 = 9.


The suggested interval size of the class intervals for a histogram can be estimated by?

highest value-lowest value/number of classes


Why the median changes by changing the size of class intervals in frequency ditribution?

Because median is the mid of the class intervals. Therefore, it is a positional measurement. Hence, if the size of class interval increases or decreases then the middle position will also increase or decrease and thus median.


How do you work out frequency density?

basically this is an exampleAGE (YEARS) FREQUENCY FREQUENCY DENSITYFD= Frequency DensityAge : 0


What happens to the confidence interval if you increase the sample size?

The confidence interval becomes smaller.


How to find acceleration?

Acceleration can be calculated by dividing the change in velocity by the time taken to make that change. The formula for acceleration is: acceleration = (final velocity - initial velocity) / time. Acceleration is a vector quantity, meaning it has both magnitude and direction.


How do you determine the skip interval in systematic sampling?

Assuming that you know the population size, N, and that you are confident that the sample size, n, you have chosen is adequate, then the skip interval is ~n/N. For example, if the populaton size if 998 and you reckon that you need a sample size of 20 then the skip interval would be 50.


What is the class mark of class interval 10.5-17.5 and class size 7?

Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14Class mark = (10.5 + 17.5)/2 = 14


What happens to width of interval if you decrease the sample size?

It will decrease too. * * * * * If it is the confidence interval it will NOT decrease, but will increase.


What happens to the width of the confidence interval when you are unable to get a large sample size?

The width of the confidence interval increases.


What size would you recommend for the class interval if the set of the data consists of 45 observations between0 and 29?

No of Observation = 45Higest value = $29Lowest Value = $0K = ?i = ?a) 1st we find out KK= 2x2x2x2x2x2 =2^6Xlasses = 6b) find out (i) = H-L/K = 29-0/6 = 29/6i= 4.833