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each section of the sat test is supposed to be distributed normally with a mean of 500 and a standard deviation of 100 suppose 5 students in a class
1 you have a regional country-year dataset over 10 years of 150 total observations within this data you have 25 observations where the ruling party
an internal report issued by the marketing manager of a oil-change franchise claims that the mean number of miles between oil changes is for
a study done at the university of maryland cited in weiss introductory statistics 7th ed 2005 measured the body temperatures of 93 healthy humans on
imagine that a sample of 400 rental units shows that i the distribution of rents paid per month is not described by a normal distributionii that the
there are n seats on an airplane and n passengers have bought tickets unfortunately the first passenger to enter the plane has lost his ticket and so
there are two diagnostic tests for a disease among those who have the disease 10 give negative results on the first test and independently of this 5
in a three-cornered paint ball duel a b and c successively take shots at each other until only one of them remains paint free once hit a player is
in an agricultural experiment we wish to compare the yields of three different varieties of wheat call these varieties a b and c we have a eld that
the elevator in the math and computer building can stop at one of six oors four riders get on the elevator at the rst oor and the elevator heads up
after analyzing the data the researcher has to test ten hypotheses various tests such as chi square test t test have been developed by statisticians
in order to derive meaningful results from the statistical tables the researcher may use one or more of the followings four stepsathe first step is
under this methods the enumerators are appointed and given training they are provided with schedules containing relevant questions these
the researcher and the respondents do not come in contact with each other if this method of survey is adopted questionnaires are mailed to the
in marketing research field surveys are commonly used to collect primary data from the respondents1through personal interviews the investigator
this methods implies the collection of information by way of investigator own observation without interviewing the respondents while the
the next step is to determine the sources of data to be used the researcher has to decide whether he has to collect primary data ror depend
sequential sampling this is somewhat complex sample design where the ultimate size of the sample is not fixed in advance but is determined according
multi stage sampling this is a further development of cluster sampling this techniques is meant for big inquiries extending to a considerably large l
cluster sampling and area sampling cluster sampling involves grouping the population and then selecting the group or the cluster rather than
quota sampling in stratified the cost of taking random samples from individual strata is often so expensive that interviewers are simply give quota
stratified sampling if the population from which a sample is to be drawn does not constitute a homogenous group then stratified sampling technique is
where an element of randomness is introduce by suing random numbers to pick up the unit with which to start this process of sampling is known as
this type of sampling is also known as chance sampling or probability where each and every item in the population has an equal change of inclusion in
suppose both the repair record 1978 and company headquarters are believed to be significant in explaining the vector price mileage weight here