Atransect is an archaeological study area that is 1/5 mile wide and 1 mile long. a site in a transect is the location of a significant archaeological find. let x represent the number of sites per transect. in a section of chaco canyon, a large number of transects showed that x has a population variance σ2 = 42.3. in a different section of chaco canyon, a random sample of 25 transects gave a sample variance s2 = 51.3 for the number of sites per transect. use a 5% level of significance to test the claim that the variance in the new section is greater than 42.3. find a 95% confidence interval for the population variance.

Step-by-step explanation:

Confidence interval formula for population variance :-

Given : and

Significance level :

Using chi-square distribution, the Critical values are:

Then, the confidence interval for population variance is given by :-

Hence, the 95% confidence interval for the population variance :

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: