2.3. Single Sample Z-Test

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Data File: https://www.theopeneducator.com/doe/hypothesis-Testing-Inferential-Statistics-Analysis-of-Variance-ANOVA/0-all-data-module-2-hypothesis-testing

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) are known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website [Data file name: DOEM2.4]. What would be an appropriate null hypothesis for this your research question?

10 points

The mean weight of US male could be equal to 90 kg

The mean weight of US male is 90 kg

The mean of weight of US male could not be equal to 90 kg

The mean weight of US male is not equal to 90 kg

Clear selection

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) is known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website. What statistical decision would you made from the analysis?

10 points

Do not reject the null hypothesis because the p-value is larger than the level of significance

Do not reject the alternative hypothesis because the p-value is smaller than the level of significance

Do not reject the null hypothesis because the p-value is smaller than the level of significance

Do not reject the alternative hypothesis because the p-value is larger than the level of significance

Clear selection

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) are known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website. What would be an appropriate statistical method for your research question?

10 points

Chi-square test

T-test

Z-test

F-test

Clear selection

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) is known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website. What contextual conclusion would you reach from the statistical analysis you have performed?

10 points

Statistically, the weight of US male population is 90 Kg

Statistically, the weight of US male population is increasing

Statistically, the weight of US male population has decreased to 87.1 kg

Statistically, the weight of US male population is not equal to 90 kg.

Clear selection

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) are known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website. What would be an appropriate alternative hypothesis for this research question?

10 points

The mean of weight of US male could not be equal to 90 kg

The mean weight of US male is 90 kg

The mean weight of US male could be equal to 90 kg

The mean weight of US male is not equal to 90 kg

Clear selection

Assume that the US male population weight data is normally distributed and currently the population mean (90 kg) and the standard deviation (20kg) is known. You want to check whether this information is valid anymore. You decided to collect a representative random sample of US male population, which can be downloaded from the open educator website. Using an appropriate statistical method, what is the p-value of the test?

10 points

0.0936

-1.72

-0.92

0.359

Clear selection

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