Question: A hospital spokesperson claims that the standard deviation of the waiting times experienced by patients in its minor emergency department is no more than 0.7 minutes. A random sample of 29 waiting times has a standard deviation of 0.90 minutes. At α=0.05​, is there enough evidence to reject the​ spokesperson's claim? Assume the population is normally distributed. Complete parts​ (a) through​ (e) below.

1. Write the claim mathematically and identify H0 and Ha.
   ​(b) Find the critical​ value(s).
   ​(c) Find the standardized test statistic for the χ2​-test.
   (d) Decide whether to reject or fail to reject the null hypothesis.
   (e) Interpret the decision in the context of the original claim.
   
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