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A national survey of 40,000 adults in the US in 1992 found that 26% of adults were current smokers. A similar survey of 37,000 adults in the US in 1966 found that 43% of adults were current smokers. Test at a 5% level of significance whether the proportion of smokers in 1991 is different from the proportion of smokers in 1965.Make sure to
1. Give the null and alternative hypotheses,
2. Calculate the test statistic, and 3. give the conclusion (including a comparison to alpha or the critical value)
A researcher wants to determine a 95% confidence interval for the mean number of hours that UMKC students spend doing homework per week.
A random sample of 2000 students showed that 860 were in favour of more movies on campus. Calculate the sample proportion for this result? Give your answer as a decimal fraction to 2 decimal places.
it is estimated that 56 of the children between the ages of 3 and 5 years are already enrolled in school. in a sample
A recent study of cardiovascular risk factors reports that 30% of adults meet the criteria of hypertension. if 15 adults are assessed, what is the probabiliy that?
since previous studies have reported that elite athletes are often deficient in their nutritional intake e.g. total
If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to
a simple random sample of 120 clocks yields nine clocks with errors in assembly.a. compute the 99 confidence interval
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
Explain the difference between independent samples and dependent samples. Classify the following as independent or dependent samples:
Develop an estimated regression equation using handling, dependability, and fit & finish to predict overall quality. Is the estimated regression equation significant? Why?
Assume that there is no available information that can be used to estimate the percentage of households in which a vehicle is owned.
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