Questions from Business Statistics

Q: A biology class conducts a bird count every week during the semester

A biology class conducts a bird count every week during the semester. Using the number of species counted each week, a student finds the following confidence interval for the mean number of species co...

Q: Here are boxplots of the points scored during the first 10 games

Here are boxplots of the points scored during the first 10 games of the season for both Scyrine and Alexandra: 1. Summarize the similarities and differences in their performance so far. 2. The coach c...

Q: After surveying students at Dartmouth College, a campus organization calculated that

After surveying students at Dartmouth College, a campus organization calculated that a 95% confidence interval for the mean cost of food for one term (of three in the Dartmouth trimester calendar) is...

Q: Based on meteorological data for the past century, a local TV

Based on meteorological data for the past century, a local TV weather forecaster estimates that the region average winter snowfall is 23", with a margin of error of ±2 inches. Assuming he used a 95% c...

Q: A waiter believes the distribution of his tips has a model that

A waiter believes the distribution of his tips has a model that is slightly skewed to the right, with a mean of $9.60 and a standard deviation of $5.40. 1. Explain why you cannot determine the probabi...

Q: A grocery store receipts show that Sunday customer purchases have a skewed

A grocery store receipts show that Sunday customer purchases have a skewed distribution with a mean of $32 and a standard deviation of $20. 1. Explain why you cannot determine the probability that the...

Q: The waiter in Exercise 3 usually waits on about 40 parties over

The waiter in Exercise 3 usually waits on about 40 parties over a weekend of work. 1. Estimate the probability that he will earn at least $500 in tips. 2. How much does he earn on the best 10% of such...

Q: Suppose the store in Exercise 4 had 312 customers this Sunday.

Suppose the store in Exercise 4 had 312 customers this Sunday. 1. Estimate the probability that the store revenues were at least $10,000. 2. If, on a typical Sunday, the store serves 312 customers, ho...

Q: Using the t-tables, software, or a calculator,

Using the t-tables, software, or a calculator, estimate 1. the critical value of t for a 90% confidence interval with df=17. 2. the critical value of t for a 98% confidence interval with df=88.

Q: Using the t-tables, software, or a calculator,

Using the t-tables, software, or a calculator, estimate 1. the critical value of t for a 95% confidence interval with df=7. 2. the critical value of t for a 99% confidence interval with df=102.