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A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Use a 99% confidence interval to estimate the true proportion of students who receive financial aid.
.59 ± .623.59 ± .007.59 ± .090.59 ± .003
Find the minimum sample size required to estimate the percentage of college students who use loans to pay for college.
A scientist wants a confidence interval of 90% and a margin of error of +-2 for a mean of a Normal population with σ =10. What size samples should she take?
A chocolate bar is considered underweight if it weighs less than 8.0 oz. What proportion of chocolate bars weighs less than 8.0 oz?
Compute the variance and standard deviation of the number that will arrive within two days.
What are some critical decisions involved in selecting an appropriate measurment scale? How might these decisions influence the research design?
The mean fare charged for service from the beach to the airport is $18.00 and the standard deviation is $3.50. We select a sample of 15 fares. What must you assume to make the above calculation?
The researcher wants to determine whether there is a relation between the type of residence owned and the level of the family income. He randomly sampled 100 homeowners and obtained the following data:
If a sampleof50 customers is selected on a given day, what is the probability, given your selected delivery time that fewer than 3 customers will receive a free newspaper?
Use Are the data statistically significant at the given level of significance? Based on your answers, will you reject or fail to reject the null hypothesis?
Use the SPSS output to determine if there is sufficient evidence to conclude that Sally bakes a better pie than Pat (i.e., the average rating for Sally at her church is higher than the average rating for Pat at her church).
an electrical engineer has two boxes containing different types of resistors. the first box contains 3 resistors of one
Do these data support the claim made by some female managers within the organizations? Report and interpret the p-value.
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