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- A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if she wishes the estimate to be within four percentage points with 90% confidence, assuming that (a) she uses the estimates of 21.8% male and 18.1% female from a previous year? (b) she does not use any prior estimates?A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 6%? A previous study indicates that the proportion of households with two cars is 23%.A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if he wishes the estimate to be within two percentage points with 95% confidence, assuming that (a)he uses the estimates of 21.5% male and 19.5% female from a previous year? (b)he does not use any prior estimates?
- A researcher wishes to estimate the number of households with two computers. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 6%? A previous study indicates that the proportion of households with two computers is 23%.A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if he wishes the estimate to be within two percentage points with 95% confidence, assuming that confidence, assuming that(a) he uses the estimates of 21.9% male and 19.4% female from a previous year?(b) he does not use any prior estimates?A researcher wants to estimate the prevalence of breast cancer among women who are between 35 and 45 years of age living in Western Visayas. How many women must be involved in the study to ensure that the estimate is precise? If national data suggest that 1 in 235 women are diagnosed with breast cancer by age 40, this translates to a proportion of 0.0043 (0.43%) or prevalence of 43 per 10,000 women. Suppose the researcher wants the estimate to be within 10 per 10,000 women with 95% confidence. What would be the sample size? Show your solution including the formula you used.
- A researcher wants to estimate the prevalence of breast cancer among women who are between 35 and 45 years of age living in Western Visayas. How many women must be involved in the study to ensure that the estimate is precise? If national data suggest that 1 in 235 women are diagnosed with breast cancer by age 40, this translates to a proportion of 0.0043 (0.43%) or prevalence of 43 per 10,000 women. Suppose the researcher wants the estimate to be within 10 per 10,000 women with 95% confidence. What would be the sample size?A researcher wishes to estimate the number of households with two types ofvegetables in their backyard gardens in Meanwood Chamba Valley of LusakaProvince. How large a sample is needed in order to be 98% confident that thesample proportion will not differ from the true proportion by more than 3%? Aprevious study indicates that the proportion of households with two types ofvegetables in their backyard gardens is 25%.A pollster wishes to estimate the proportion of United States voters who favor capital punishment. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 5%?
- A researcher wishes to estimate the proportion of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 3%? A previous study indicates that the proportion of households with two cars is 40%.A company is interested in evaluating its current inspection procedure on shipments of 50 identical items. The procedure is to take a sample of 5 and pass the shipment if no more than 2 are found to be defective. What proportion of 20% defective shipments will be accepted?B. The best predicted circumference for a diameter of 1.9 cm is___cm. C. How does the result compare to the actual circumference? Since1.9 cm is within the scope of the sample diameters, the predicted value yields the actual circumference. Even though 1.9 cm is within the scope of the sample diameters, the predicted value yields a very different circumference. Since1.9 cm is beyond the scope of the sample diameters, the predicted value yields a very different circumference. Even though 1.9 cm is beyond the scope of the sample diameters, the predicted value yields the actual circumference.
