normal distribution p value

A company claims that the standard deviation of the gear speed for a piece of machinery is 28 revolutions per minute (rpm). An engineer selected a random sample of 20 machines and found the standard deviation as 40 (rpm). At α = 0.01, is there enough evidence to reject the company's claim? Wh..

A survey on hospitals concluded that the standard deviation of the amount of time a patient has to wait before being attended by emergency room personnel is more than 5.4 minutes. Waiting times in the case of a sample of 16 patients are recorded and it was found that the standard deviation was 6.6 ..

Normality is defined as the number of gram equivalents of solute present per litre (dm 3 ) of the solution at any given temperatur..

Normality of a solution is defined as the number of gram equivalents (gm.e) of a solute dissolved per litre of the given solution. Mathematically it is, Normality is expressed by the symbol N. It can also be expressed as,..

Normality is defined as the number of gram equivalents of solute present per litre (dm 3 ) of the solution at any given temperature. It is expressed as N. In terms of weight, Normality of the substance can be expressed as:..

When can the normal distribution be used as an approximation to the binomial distribution? => n . p = 5, n . q = 5 or n . p ≤ 5, n . q ≤ 5 or n . p > 5, n . q < 5 or n . p ≥ 5, n . q ≥ 5..

The sales in dollars of a new store for a random sample of 10 days in a month are as follows. 450 600 540 650 480 520 680 590 610 550 At α = 0.01, is there enough evidence for the merchandiser to conclude that the standard deviation of the sales per day is more than $60? What is the p -v..

The charity organizer estimates that the variance of the amount collected from different public schools in a state will be more than $1,024. The amount collected from a random sample of 10 schools are as follows. $1000 $1100 $1050 $958 $986 $1026 $982 $1045 $1030 $1054 Find the chi-square test ..

With regards to distribution they are of 3 types. National, multi national and internationa..

Light affects the distribution of animals by affecting the vegetation. For example Tundra biome is characterized by insufficient light, low temperature, less vegetation so less animal life. While tropical area is characterized by high rainfall, strong light, sufficient vegetation and abu..