Part d please In 2017, Americans spent a record-high $9.1 billion on Halloween related purchases (the balance). Sample data showing the amount spent on a Halloween costume are: 12 69 22 64 33 36 31 44 52 16 13 98 45 32 63 26 (a) What is the estimate of the population mean amount adults spend on a Halloween costume? (b) What is the sample stan
Part d please
In 2017, Americans spent a record-high $9.1 billion on
Halloween related purchases (the balance). Sample data showing the amount spent on a Halloween costume are:
12 69 22 64
33 36 31 44
52 16 13 98
45 32 63 26
(a) What is the estimate of the population mean amount adults spend on a Halloween costume?
(b) What is the sample standard deviation (and variance)?
(c) Provide a 95% confidence
(d) Test H0 : σ^2 = 500 and H0 : σ^2 ≥ 625. Write down both tests with their alternatives. Report the statistic and perform the test using both approaches p-value and critical value approach.
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