Estimation: sample size of defective lightbulbs

A lightbulb manufacturer wants to estimate the average number of defective bulbs contained in a box shipped by the company. Production personnel at this company have recorded the number of defective bulbs found in each of the 1000 boxes shipped during the past week. This data is in the attached file. a. what sample size would ...continues

Confidence Intervals

Consider the given set of average annual household income levels of citizens of selected US metropolitan areas in the attached file. a. Use Excel to obtain a simple sample of size 15 from this frame. b. Using the sample generated in part a, construct a 99% confidence interval for the mean average annual household income le ...continues

Confidence Interval Proportion: Pepsi over Coke Classis

A market research consultant hired by Pepsi-Cola Co. is interested in determining the proportion of consumers who favor Pepsi-Cola over Coke Classic in a particular urban location. A random sample of 250 consumers from the market under imvestigation is provided in the attached file. Construct a 90% confidence interval for the pr ...continues

The case of the soft software proposal

I need help to answer this question. 1. Analyze Leadership Business Strategy based on the software proposal case. Thanks.

A manufacturer is interested in determining whether it can claim that the boxes of detergent it sells contain, on average, more than 500 grams of detergent.

A manufacturer is interested in determining whether it can claim that the boxes of detergent it sells contain, on average, more than 500 grams of detergent. From past experience the manufacturer knows that the amount of detergent in the boxes is approximately normally distributed. The firm selects a random sample of 100 boxes an ...continues

Hypothesis Testing: Confidence interval for average height of US Navy recruits

A US Navy recruiting center knows from past experience that the height of its recruits are normally distributed with mean 68 inches. The recruiting center wants to test the claim that the average height of this year's recruits is greater than 68 inches. To do this, recruiting personnel take a random sample of 64 recruits from th ...continues

Hypothesis Testing

A study is performed in a large southern town to determine whther the average weekly grocery bill per four person family in the town is significantly different from the national average. A random sample of the weekly grocery bills of four person families in this town is given in the attached file. a. Assume that the national ...continues

Hypothesis Testing

An aircraft manufacturer needs to buy aluminum sheets with an average thickness of 0.05 inch. The manufacturer knows that the thinner sheets would be unsafe and considerably thicker sheets would be too heavy. A random sample of 100 sheets from a potential supplier is collected. The thickness of each sheet in this sample is measu ...continues

Prototypes: Vaporware Awards for unreleased products

One of the disadvantages of building a prototype is that people will believe that the final system will follow shortly. Why do you think building a prototype will lead people to this inaccurate conclusion? If you were delivering a system prototype, how would you communicate to the system users that the real system would not be r ...continues

Hypothesis Testing: Confidence Interval for battery life

A large buyer of household batteries wants to decide which of two equally priced brands to purchase. To do this he takes a random sample of 100 batteries of each brand. The lifetimes measures in hours, of the batteries are recorded in the attached file. a. Using the given sample data, generate a 95% confidence interval for th ...continues