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a) Determine the range of the measurements.

b) Dividing the range by 7, the number of subintervals selected, and rounding, we have a class interval width of 5. Using 70.5 as the lower limit of the first interval, construct a frequency histogram and cumulative frequency curve.

c) Find the mean, median and standard deviation for the data set.

From the histogram constructed and also the measures of central tenency calculated, what can you conclude about the distribution of the data?

A group of second year Forestry students conducted an experiment to compare the germination time (in days) for pine seeds sown in a green house with those sown outside the green house. Ten (10) seeds of pine were sown in the green house and ten (10) other seeds of pine were sown outside the green house. The number of days it took each seed to germinate was recorded and the following were the results.

Greenhouse 41 35 33 36 40 46 31 37 34 30

Outside 52 57 62 55 64 57 56 55 60 59

Calculate the mean, variance and standard error of the mean for each data set.

Test for equality of variances for the two data sets. Use α=0.10.

Do the data provide sufficient evidence to indicate that the mean germination time for seeds sown in the greenhouse was less than for seeds sown outside? Use α=0.05.

State three assumptions which are common for both tests conducted in b) and c).

1. 3 or more defective

2. 4 or less defective

It is claimed that the average weight of a bag of biscuits is 250 grams with a standard deviation 20.5 grams. Would you agree to this claim if random sample of 50 bags of biscuits showed a average weight of 240 grams, using a 0.05 evel of significance?