Author Archives: Anonymous
A study shows that 18 out of 40 students own a smartphone. A…
A study shows that 18 out of 40 students own a smartphone. A company claims that more than 50% of students own a smartphone. Use a significance level of .01 to test the company’s claim. Find the following and state the conclusion in context of the problem. State whether you use a t-test, z-test or proportion test – Null Hypothesis (H₀): – Alternative Hypothesis (Ha): – p-value: – Conclusion:
Read DetailsA factory claims that the average number of items produced p…
A factory claims that the average number of items produced per day is 150. You check 30 days of production and find the average is 145. The standard deviation of the sample is 10 items. Is the average production less than 150 items per day? Use a significance level of .05. Find the following and state the conclusion in context of the problem. State whether you use a t-test, z-test or proportion test Null Hypothesis (H0): Alternative Hypothesis (Ha): p-value: Conclusion:
Read DetailsIt has been reported that the mean head circumference of adu…
It has been reported that the mean head circumference of adult males is 55.90 cm with a standard deviation 1.7 cm. In a study involving 63 randomly selected male college students the mean head circumference was 55.12 cm. Test the claim that male college students have smaller heads than the average adult make. Use a .05 significance level. Find the following and state the conclusion in context of the problem. State whether you use a t-test, z-test or proportion test- Null Hypothesis (H₀): – Alternative Hypothesis (Ha): – p-value: – Conclusion:
Read DetailsA researcher is investigating whether the average height of…
A researcher is investigating whether the average height of adult women in a city is different from the national average of 64 inches. The researcher collects data on a random sample of adult women from the city.a. Write the null hypothesis.b. Write the alternative hypothesis.
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