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Manufacturers are testing a die to ensure that it is fair (has a uniform distribution). They roll the die 78 times and record the outcomes. They conduct a chi-square Goodness-of-Fit hypothesis test at the [tex]$1 \%$[/tex] significance level.

(a) The null and alternative hypotheses are:
- [tex]$H_0$[/tex]: The die has the uniform distribution.
- [tex]$H_a$[/tex]: The die does not have the uniform distribution.

(b) [tex]$\chi_0^2 = 11.692$[/tex]

(c) [tex]$\chi_{0.01}^2 = 15.086$[/tex]

(d) What conclusions can be made? Select all that apply.

Select all that apply:
- We should reject [tex]$H_0$[/tex].
- We should not reject [tex]$H_0$[/tex].


Sagot :

To solve this problem, we need to determine whether we should reject or not reject the null hypothesis [tex]\( H_0 \)[/tex] based on the chi-square Goodness-of-Fit test results.

1. Restate the hypotheses:
- Null hypothesis ([tex]\( H_0 \)[/tex]): The die has a uniform distribution.
- Alternative hypothesis ([tex]\( H_a \)[/tex]): The die does not have a uniform distribution.

2. Given information:
- Calculated chi-square value ([tex]\( \chi^2 \)[/tex] or [tex]\( \chi_0^2 \)[/tex]): 11.692
- Critical chi-square value at 1% significance level ([tex]\( \chi_{0.01}^2 \)[/tex]): 15.086
- Significance level ([tex]\( \alpha \)[/tex]): 0.01 (or 1%)

3. Decision rule for the chi-square test:
- If the calculated chi-square value is greater than the critical chi-square value, we reject [tex]\( H_0 \)[/tex].
- If the calculated chi-square value is less than or equal to the critical chi-square value, we do not reject [tex]\( H_0 \)[/tex].

4. Compare the calculated chi-square value to the critical chi-square value:
- Calculated chi-square value: 11.692
- Critical chi-square value: 15.086

5. Make the decision:
- Since the calculated chi-square value (11.692) is less than the critical chi-square value (15.086), we do not reject the null hypothesis [tex]\( H_0 \)[/tex].

6. Conclusion:
- We should not reject [tex]\( H_0 \)[/tex].

Therefore, the conclusions that can be drawn are:

- We should not reject [tex]\( H_0 \)[/tex].