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A hospital spokesperson claims that the standard deviation of the waiting times experienced by patients in...

A hospital spokesperson claims that the standard deviation of the waiting times experienced by patients in its minor emergency department is no more than 0.4 minutes. A random sample of 22 waiting times has a standard deviation of 0.9 minutes. At alphaequals 0.05​, is there enough evidence to reject the​ spokesperson's claim? Assume the population is normally distributed. Complete parts​ (a) through​ (e) below.

a- Write the claim mathematically and identify H0 & Ha

b-find critical Value(s)

c-find Standaridized test statistics

d- decide to reject or fail to reject the null hypothesis

e- interpet the decision in the context of the original claim

.

Math   Statistics-And-Probability   
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