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ladybee05
05.05.2020 •
Mathematics
A local brewery produces three premium lagers named Half Pint, XXX, and Dark Night. Of its premium lagers, they bottle 40% Half Pint, 40% XXX, and 20% Dark Night lagers. In a marketing test of a sample of consumers, 36 preferred the Half Pint lager, 35 preferred the XXX lager, and 9 preferred the Dark Night lager. Using a chi-square goodness-of-fit test, decide to retain or reject the null hypothesis that production of the premium lagers matches these consumer preferences using a 0.05 level of significance.
a. State the value of the test statistic.
b. Retain or reject the null hypothesis?
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Ответ:
(a) The test statistic value is, 5.382.
(b) Retain the null hypothesis.
Step-by-step explanation:
A Chi-square test for goodness of fit will be used in this case.
The hypothesis can be defined as:
H₀: The observed frequencies are same as the expected frequencies.
Hₐ: The observed frequencies are not same as the expected frequencies.
The test statistic is given as follows:
The information provided is:
Observed values:
Half Pint: 36
XXX: 35
Dark Night: 9
TOTAL: 80
The expected proportions are:
Half Pint: 40%
XXX: 40%
Dark Night: 20%
Compute the expected values as follows:
E (Half Pint)![=\frac{40}{100}\times 80=32](/tpl/images/0640/7114/d9c72.png)
E (XXX)![=\frac{40}{100}\times 80=32](/tpl/images/0640/7114/d9c72.png)
E (Dark night)![=\frac{20}{100}\times 80=16](/tpl/images/0640/7114/58693.png)
Compute the test statistic as follows:
The test statistic value is, 5.382.
The degrees of freedom of the test is:
n - 1 = 3 - 1 = 2
The significance level is, α = 0.05.
Compute the p-value of the test as follows:
p-value = 0.1463
*Use a Ch-square table.
p-value = 0.1463 > α = 0.05.
So, the null hypothesis will not be rejected at 5% significance level.
Thus, concluding that the production of the premium lagers matches these consumer preferences.
Ответ:
yes because when there is a parenthesis next to a number like 5(6) it means to multiply both together just like f(x) is to multiply each other