2. For a random sample of 25 students from a large class, the accompanying table shows the amounts of time spent for a test: Study Time (hours) 0-4 4-8 8-12 12-16 16-20 Number of Students 3 7 5 2 a. Draw the histogram. b. Find the relative frequencies. Find the cumulative relative frequencies and draw the corresponding histogram. d. Estimate the sample mean study time. С. Estimate the sample standard deviation. In which class is the sample median? e. f.

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A: Class(1) Frequency (f)(2) Mid value (x)(3) f⋅x(4)=(2)×(3) cf(6) 0-10 4 5 20 4 10-20 23 15 345 27…

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A: Mean = ΣXi/n = (160+150+165+180+175+172)/6 =167 Variance= ΣXi2/n -(mean2)…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.