A sample of 10 mathematics books of grade 7 had the following number o..
A sample of 10 mathematics books of grade 7 had the following number of pages. Find the 98% confident interval for the variance of the pages. Assume that the variable is normally distributed. 1000 1320 590 820 1150 1570 1090 1585 995 1285 => between 38110 and 345769 or between 49895 and 517733..
A teacher wishes to estimate the average weight of 10 students of grad..
A teacher wishes to estimate the average weight of 10 students of grade 6 taken randomly. The weight(in pounds) of the students are shown. Find the 99% confidence interval for the variance for the weights of students. Assume that the variable is normally distributed. 90 88 96 85 91 93 82 75 70..
The students of Environmental studies collected the data of the life s..
The students of Environmental studies collected the data of the life span of Zebras from the zoological authorities which are as follows. 20, 12, 19, 22, 28, 30, 17, 25, 10, 23, 16, 18, 21, 32, 15, 14, 8, 22, 11, 13, 18, 20, 21, 19, 19 Find the average life span of a Zebra by constructing a frequen..
The table shows the scores of boys in the final examination. Determine..
The table shows the scores of boys in the final examination. Determine the nature of the distribution. Score Percent of boys 30 5 40 10 50 15 60 20 70 15 80 10 90 5 => normally distributed or negatively skewed or deviates from normality or positively skewed..
A field survey shows the lifetime (in years) of a particular model of ..
A field survey shows the lifetime (in years) of a particular model of a washing machine in the frequency distribution table. Lifetime of washing machines Number of washing machines 0 - 2 5 2 - 4 16 4 - 6 13 6 - 8 7 8 - 10 5 10 - 12 4 Find the variance and standard deviation. => ..
The blood urea nitrogen (in milligrams per deciliter - mg/dl) count of..
The blood urea nitrogen (in milligrams per deciliter - mg/dl) count of 20 randomly selected patients is shown in the frequency distribution table. Blood urea nitrogen Frequency 11 - 13 3 13 - 15 4 15 - 17 3 17 - 19 5 19 - 21 5 Find the variance and standard deviation. => 6.7, 2...
Hundred digits were chosen at random from a set of tables. The frequen..
Hundred digits were chosen at random from a set of tables. The frequencies of the digits were: Digit 0 1 2 3 4 5 6 7 8 9 Frequency 8 7 13 10 12 14 8 7 9 12 At level of significance α = 0.05, find the chi-square test value and check if the digits distributed are in equal nu..
The scores of 60 students of a class are shown in the frequency distri..
The scores of 60 students of a class are shown in the frequency distribution. Scores Frequency 86 - 96 14 97 - 107 7 108 - 118 13 119 - 129 10 130 - 140 11 141 - 151 5 Find the mean and the modal class of the data. => 115 and 151 or 115.2 and 86 - 96 or 115.3 and 141 - 151 or 115.2 and 14..
A survey of 47 selected distributions showed these number of days that..
A survey of 47 selected distributions showed these number of days that the load took to reach the shipment from the day it was ordered. Days Frequency 1 - 4 12 5 - 8 8 9 - 12 15 13 - 16 5 17 - 20 7 Find the mean and the modal class of the data. => 9.39 and 9 or 9.39 and 9 - 12 or 9.39 and..
The quiz scores of 50 students of a class is as shown in the frequency..
The quiz scores of 50 students of a class is as shown in the frequency distribution. Quiz score Frequency 0 - 2 6 3 - 5 13 6 - 8 9 9 - 11 14 12 - 14 8 Find the variance and standard deviation. => 7.3 and 68.14 or 3.89 and 1.97 or 3.89 and 15.15 or 15.15 and 3.89..
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