An ice cream truck vender sells 15 vanilla ice cream bars every 2 hours At this rate, how many hours does it take the vendor to
1 answer:
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Answer: 1.960
Step-by-step explanation:
The value of z we use to calculate a confidence interval with a () confidence level is a two-tailed test value i.e. represented by :-
Given : The level of confidence:
Then, significance level :
With the help of standard normal distribution table for z , we have
Hence, the value of z should be used to calculate a confidence interval with a 95% confidence level =1.960