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Viewed Questions

The waiting time for customers at MacBurger Restaurants follows a normal distribution with a population standard deviation of 1 minute. At the Warren Road MacBurger, the quality-assurance department sampled 50 customers and found that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?

Statistical Techniques in Business and Economics

A large on-demand video streaming company is designing a large-scale survey to determine the mean amount of time corporate executives watch on-demand television. A small pilot survey of 10 executives indicated that the mean time per week is 12 hours, with a standard deviation of 3 hours. The estimate of the mean viewing time should be within one-quarter hour. The $95 \%$ level of confidence is to be used. How many executives should be surveyed?

A large on-demand video streaming company is designing a large-scale survey to determine the mean amount of time corporate executives watch on-demand television. A small pilot survey of 10 executives indicated that the mean time per week is 12 hours, with a standard deviation of 3 hours. The estimate of the mean viewing time should be within one-quarter hour. The $95 \%$ level of confidence is to be used. How many executives should be surveyed?

Basic Statistics for Business & Economics

Schadek Silkscreen Printing Inc. purchases plastic cups and imprints them with logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups and inspected them for defects. He found 15 to be defective a. What is the estimated proportion defective in the population? b. Develop a $95 \%$ confidence interval for the proportion defective. c. Zack has an agreement with his supplier that if $10 \%$ or more of the cups are defective, he can return the order. Should he return this lot? Explain your decision.

Schadek Silkscreen Printing Inc. purchases plastic cups and imprints them with logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups and inspected them for defects. He found 15 to be defective a. What is the estimated proportion defective in the population? b. Develop a $95 \%$ confidence interval for the proportion defective. c. Zack has an agreement with his supplier that if $10 \%$ or more of the cups are defective, he can return the order. Should he return this lot? Explain your decision.

Basic Statistics for Business & Economics

The Fox TV network is considering replacing one of its prime-time crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives designed an experiment to estimate the proportion of their viewers who would prefer the comedy show over the crime investigation show. A random sample of 400 viewers was selected and asked to watch the new comedy show and the crime investigation show. After viewing the shows, 250 indicated they would watch the new comedy show and suggested it replace the crime investigation show. a. Estimate the value of the population proportion of people who would prefer the comedy show. b. Develop a $99 \%$ confidence interval for the population proportion of people who would prefer the comedy show. c. Interpret your findings.

The Fox TV network is considering replacing one of its prime-time crime investigation shows with a new family-oriented comedy show. Before a final decision is made, network executives designed an experiment to estimate the proportion of their viewers who would prefer the comedy show over the crime investigation show. A random sample of 400 viewers was selected and asked to watch the new comedy show and the crime investigation show. After viewing the shows, 250 indicated they would watch the new comedy show and suggested it replace the crime investigation show. a. Estimate the value of the population proportion of people who would prefer the comedy show. b. Develop a $99 \%$ confidence interval for the population proportion of people who would prefer the comedy show. c. Interpret your findings.

Basic Statistics for Business & Economics

Questions asked

INSTANT ANSWER

A survey of 36 randomly selected iPhone owners showed that the purchase price has a mean of $650 with a sample standard deviation of $24. (Use t Distribution Table & the t-distribution table to find a z-statistic (df = infinity).) Required: What is the point estimate of the population mean? What is the point estimate of the population standard deviation? What is the standard error of the sample mean?

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ANSWERED

Jerelyn Nevil verified

Numerade educator

A chain of sport shops catering to beginning skiers, headquartered in Aspen, Colorado, plans to conduct a study of how much a beginning skier spends on the initial purchase of equipment and supplies. Based on these figures, it wants to explore the possibility of offering combinations, such as a pair of boots and a pair of skis, to induce customers to buy more. A sample of 44 cash register receipts revealed these initial purchases: $139 $82 $139 $161 $175 $82 $132 $149 $140 133 263 238 132 172 149 152 213 105 220 126 90 171 162 229 121 112 149 126 126 118 172 156 213 87 172 230 162 195 128 126 142 118 127 126 Organize the data into a frequency distribution using a lower limit of $80.

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ANSWERED

Lucas Finney verified

Numerade educator

Sponsors of a local charity decided to attract wealthy patrons to its $500-a-plate dinner by allowing each patron to buy a set of 20 tickets for the gaming tables. The chance of winning a prize for each of the 20 plays is 50–50. If you bought 20 tickets, what is the chance of winning 15 or more prizes? Multiple Choice 0.021 0.750 0.006 0.250

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ANSWERED

Sanchit Jain verified

Numerade educator

What is the area under the normal curve between z = −1.0 and z = −2.0? Multiple Choice 0.4772 0.3413 0.0228 0.1359

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ANSWERED

Joanna Quigley verified

Numerade educator

A recent study reported that Americans spend an average of 300 minutes per day watching TV. Assume the distribution of minutes per day watching TV follows a normal distribution with a standard deviation of 26 minutes. Let’s define a “binge watcher” as someone in the upper 5% of the distribution of minutes watching TV. How many minutes does a “binge watcher” spend per day watching TV?

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ANSWERED

Donna Densmore verified

Numerade educator

The speed with which utility companies can resolve problems is very important. In the United Kingdom, Octopus Energy reports it can resolve customer problems the same day they are reported in 70% of the cases. Suppose the 15 cases reported today are representative of all complaints. What is the probability 9 of the problems can be resolved today? Note: Round your answer to 3 decimal places. What is the probability 9 or 10 of the problems can be resolved today? Note: Round your answer to 3 decimal places. What is the probability more than 10 of the problems can be resolved today? Note: Round your answer to 3 decimal places.

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INSTANT ANSWER

b. What in the probablity 7 of the problens can be nerioletd lobey? Nate: Asund your anawer so 3 decimal placen. \( \square \) 4. What is the probabily ? \( \square \) Mate: Rousd pour anawer in I decimal places. \( \square \)

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INSTANT ANSWER

Using the following discrete probability distribution, x P(x) 6 0.1 12 0.2 18 0.3 24 0.4 An older version of the Microsoft Excel logo. Click here for the Excel Data File Required: What are the values of the random variable? What is the mean of the distribution? Note: Round your answer to 1 decimal place. What is the standard deviation of the distribution? Note: Round your answer to 2 decimal places. What is the probability that the random variable is not equal to 6? Note: Round your answer to 1 decimal place. What is the probability that the random variable is 18 or less?

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ANSWERED

Benjamin Densmore verified

Numerade educator

A sample of 42 oil industry executives was selected to test a questionnaire. One question about environmental issues required a yes or no answer. Required: What is the experiment?

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INSTANT ANSWER

The percent increase in sales for the last 4 years at Combs Cosmetics were 4.91, \( 5.75,8.12 \), and 21.60 . (a) Find the geometric mean percent increase.

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