MATH 225N ASSIGNMENT UNDERSTANDING CONFIDENCE INTERVALS EXCEL, Exams of Nursing

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UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

A company wants to determine a confidence interval for the average CPU time of its teleprocessing transactions. A sample of 70 random transactions in milliseconds is given below. Assume that the transaction times follow a normal distribution with a standard deviation of 600 milliseconds. Use Excel to determine a 98% confidence interval for the average CPU time in milliseconds. Round your answers to the nearest integer and use ascending order.

A sample of 22 test-tubes tested for number of times they can be heated on a Bunsen burner before they crack is given below. Assume the counts are normally distributed. Use Excel to construct a 99% confidence interval for μ. Round your answers to two decimal places and use increasing order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

Suppose scores on exams in statistics are normally distributed with an unknown population mean. A sample of 26 scores is given below. Use Excel to find a 90% confidence interval for the true mean of statistics exam scores. Round your answers to one decimal place and use increasing order.

Question

Suppose that the scores of bowlers in a particular league follow a normal distribution such that the standard deviation of the population is 12. Find the 95% confidence interval of the mean score for all bowlers in this league using the accompanying data set of 40 random scores. Round your answers to two decimal places and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

In a random sample of 350 attendees of a minor league baseball game, 184 said that they bought food from the concession stand. Create a 95% confidence interval for the proportion of fans who bought food from the concession stand. Use Excel to create the confidence interval, rounding to four decimal places.

Question

In a survey of 603 adults, 98 said that they regularly lie to people conducting surveys. Create a 99% confidence interval for the proportion of adults who regularly lie to people conducting surveys. Use Excel to create the confidence

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

interval, rounding to four decimal places.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

The amounts of time that customers stay in a certain restaurant for lunch is normally distributed with a standard deviation of 17 minutes. A random sample of 50 lunch customers was taken at this restaurant. Construct a 99% confidence interval for the true average amount of time customers spend in the restaurant for lunch. Round your answers to two decimal places and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Installation of a certain hardware takes a random amount of time with a standard deviation of 7 minutes. A computer technician installs this hardware on 50 different computers. These times are given in the accompanying dataset. Compute a 95% confidence interval for the mean installation time. Round your answers to two decimal places and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of 25 pieces of carry-on luggage was collected and weighed in pounds. Assume that the

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

population is normally distributed with a standard deviation of 5 pounds. Find the 95% confidence interval of the mean weight in pounds. Round your answers to two decimal places and use ascending order.

Question

Assume that farm sizes in a particular region are normally distributed with a population standard deviation of 150 acres. A random sample of 50 farm sizes in this region is given below in acres. Estimate the mean farm size for this region with 90% confidence. Round your answers to two decimal places and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

In a city, 22 coffee shops are randomly selected, and the temperature of the coffee sold at each shop is noted. Use Excel to find the 90% confidence interval for the population mean temperature. Assume the temperatures are approximately normally distributed. Round your answers to two decimal places and use increasing order.

Question

An automobile shop manager timed 27 employees and recorded the time, in minutes, it took them to change a water pump. Assuming normality, use Excel to find the 99% confidence interval for the true mean. Round your answers to three decimal places and use increasing order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

The table below provides a random sample of 20 exam scores for a large geology class. Use Excel to construct a 90% confidence interval for the mean exam score of the class. Round your answers to one decimal place and use ascending order.

Question

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

The heart rates for a group of 21 students taking a final exam are given below. Assume the heart rates are normally distributed. Use Excel to find the 95% confidence interval for the true mean. Round your answers to two decimal places and use increasing order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

The yearly incomes, in thousands, for 24 random married couples living in a city are given below. Assume the yearly incomes are approximately normally distributed. Use Excel to find the 95% confidence interval for the true mean, in thousands. Round your answers to three decimal places and use increasing order.

Question

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

A business magazine conducted a survey of 751 employees who had been at their current employer for 5 or more years. Of these employees, 295 responded that they were bored in

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

their current position. Create a 99% confidence interval for the proportion of employees who have been with their current employer for 5 or more years and reported being bored in their current position. Use Excel to create the confidence interval, rounding to four decimal places.

Question

In a survey of 329 people who attended a local professional soccer team’s most recent home game, 141 said that they were fans of the visiting team. Create a

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

95% confidence interval for the population proportion of attendees who were fans of the visiting team. Use Excel to create the confidence interval, rounding to four decimal places.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

Recent studies have shown that out of 1,000 children, 885 children like ice cream. What is the 99% confidence interval for the true proportion of children who like ice cream, based on this sample? Round z ⋆ to two decimal places and other answers to four decimal places.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

In a survey of 1,000 adults in a country, 722 said that they had eaten fast food at least once in the past month. Create a 95% confidence interval for the population proportion of adults who ate fast food at least once in the past month. Use Excel to create the confidence interval, rounding to four decimal places.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

A city is holding a referendum on increasing property taxes to pay for a new high school. In a survey of 458 likely voters, 254 said that they would vote “yes” on the referendum. Create a 95% confidence interval for the proportion of likely voters who will vote “yes” on the referendum. Use Excel to create the confidence interval, rounding to four decimal places.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

Assume the distribution of commute times to a major city follows the normal probability distribution and the standard deviation is 4.5 minutes. A random sample of 104 commute times is given below in minutes. Use Excel to find the 98% confidence interval for the mean travel time in minutes. Round your answers to one decimal place and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

The following data represent a random sample for the ages of 41 players in a baseball league. Assume that the population is normally distributed with a standard deviation of 2.1 years. Use Excel to find the 98% confidence interval for the true mean age of players in this league. Round your answers to three decimal places and use ascending order.

Question

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

The number of hours worked per year per adult in a state is normally distributed with a standard deviation of 37. A sample of 115 adults is selected at random, and the number of hours

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

worked per year per adult is given below. Use Excel to calculate the 98% confidence interval for the mean hours worked per year for adults in this state. Round your answers to two decimal places and use ascending order.

Question

The monthly incomes from a random sample of 20 workers in a factory is given below in dollars. Assume the population has a normal distribution and has standard deviation $518. Compute a 98% confidence interval for the mean of the population. Round your answers to the nearest dollar and use ascending order.

UNDERSTANDING CONFIDENCE INTERVALS

EXCEL

Question

Weights, in pounds, of ten-year-old girls are collected from a neighborhood. A sample of 26 is given below. Assuming normality, use Excel to find the 98% confidence interval for the population mean weight μ. Round your answers to three decimal places and use increasing order.

Question