Mb0040 – Statistics for Management

Topics: Null hypothesis, Type I and type II errors, Arithmetic mean Pages: 4 (943 words) Published: February 10, 2011
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1- Statistical survey is a scientific process of collection and analysis of numerical data used to collect information about units. Questionnair and schedule are both methods of collecting data in statistical survey. At questionnair the questions is sent by mail to respondents to fill it and send it back. At schedule the questions is filled by the enumerator. Questionnair is a cheaper process than schedule when it was in a large samples or population. Questionnair should be filled by litrate and cooperative but scheduke is filled enumurator. Risk of misunderstanding of quwstions in questionnair is more than schedule.

2- Data representation of family expenditure using Pie Chart

X = X1*n1 + X2*n2
n1 +n2
where X = Combined arithmetic mean = 10.9

X1 = arithmetic mean of sample (1) = 10.4 and n1 = No. of sample (1) = 100 X2 = arithmetic mean of sample (1) = ? and n1 = No. of sample (2) = 150

So… 10.9 = 10.4 * 100 + X2 * 150
100 + 150
2725 = 1040 + X2 * 150 1685 = X2 * 150
X2 = 11.23

So the average weight of screws of box B = 11.23

4- (a) As a decision maker in many cases you have to take action about implementing, producing or manufacturing either of one or two or some times more course of actions. With the help of rules of probability you can make the right decision of which you can implement. In case of one of events to be implemented the Addition rule is used and states: If ‘A’ and ‘B’ are any two events then the probability of the occurrence of either ‘A’ or ‘B’ is given by: P(A ∪ B) = P(A) + P(B) - P(A ∩ B) If ‘A’ and ‘B’ are two mutually exclusive events then the probability of occurrence of either A or B is given by: P(A ∪ B) = P(A) + P(B)

If A, B and C are any three events then the probability of occurrence of either A or B or C is...
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