An article in fire technology describes the investigation of two different foam expanding agents that can be used in the nozzle of fire fighting spray equipment. a random sample of five observations with an aqueous film forming foam had a sample mean of 4.340 and a standard deviation of 0.508. a random sample of five observations with alcohol type concentrates had a sample mean of 7.091 and a standard deviation of 0.430. assume that both populations are well represented by normal distribution with the same standard deviations

(a) is there evidence to support the claim that there is no difference in mean foam expansion of these two agents. use a fixed level test with alpha=0.10

(b) calculate the p-value for this test (using alpha = 0.05).

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

c

step-by-step explanation:

using pemdas, (order of operations) you'll see the answer is 24.