A study on cell phone use measured the number of minutes people chat on their cell...

Ages 11-21: µ = 306 mins., σ = 30 mins.

Ages 21-30: µ = 189 mins., σ = 22 mins.

Ages 31-40: µ = 240 mins., σ = 15 mins.

a) What percent of 21-30 year-old cell users talk 150 minutes or less a day? Draw the picture!

b) What percent of 31-40 year-old cell users talk 275 or more a day? If there are 300 people in this age group, how many of them uses 275 or more a day? Draw the picture!

c) What percent of 11-21 year-olds talk between 300 to 345 minutes a day? Draw the picture!

d) How many 21-30 year-olds uses 210 minutes or more a day if there were 330 people in that age group? Draw the picture!

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

A study on cell phone use measured the number of minutes people chat on their cell...

A study on cell phone use measured the number of minutes people chat on their cell phones each day. Three age groups were measured and were found to be normally distributed. Use the data below to answer the following questions. Ages 11-21: µ = 306 mins., σ = 30 mins. Ages 21-30: µ = 189 mins., σ = 22 mins. Ages 31-40: µ = 240 mins., σ = 15 mins. a) What percent of 21-30 year-old cell users talk 150...

In the study of cell phone use and brain hemispheric dominance, an internet survey was emailed...

In the study of cell phone use and brain hemispheric dominance, an internet survey was emailed to 2524 subjects randomly selected from an online group involved with ears. 930 surveys were returned. Construct a 99% confidence interval for the proportion of returned surveys. A. Find the best point estimate of the population proportion p B. Identify the value of the margin of error E. C. Construct the confidence interval

In a study of cell phone use and brain hemispheric dominance, an internet survey was emailed...

In a study of cell phone use and brain hemispheric dominance, an internet survey was emailed to 2601 subjects randomly selected from an online group involved with ears. 975 surveys were returned. Construct a 90% confidence interval for the proportion of returned surveys. a) What is the best point estimate of the population P c) Construct the confidence level b) Identify the value of the margin of error E. c) Construct the confidence level.

83. Suppose that the length of long distance phone calls, measured in minutes, is known to...

83. Suppose that the length of long distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to eight minutes. a. Define the random variable. X= ________________. b. Is X continuous or discrete? c. μ= ________ d. σ= ________ e. Draw a graph of the probability distribution. Label the axes. f. Find the probability that a phone call lasts less than nine minutes. g. Find the probability that a...

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed...

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2616 subjects randomly selected from an online group involved with ears.1023 surveys were returned. Construct a 99% confidence interval for the proportion of returned surveys. 1. find the best point estimate of the population proportion p ( round to three decimal places as needed) 2. identify the value of the margin of error E 3. Construct the convidence interval ____<p<______ 4. write a...

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed...

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2592 subjects randomly selected from an online group involved with ears. 913 surveys were returned. Construct a 99% confidence interval for the proportion of returned surveys.

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed...

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2446 subjects randomly selected from an online group involved with ears. 1083 surveys were returned. Construct a 99% confidence interval for the proportion of returned survey.

Digicom is a wireless services company with a monthly demand for cell phone minutes for each...

Digicom is a wireless services company with a monthly demand for cell phone minutes for each client that can be expressed as follows: P = $2 – 0.02Q Where P is the price paid by the client per minute and Q is the number of minutes bought by the client each month. The marginal cost is $0.20 per minute. Assume now that Digicom offers a two-part tariff with a monthly fixed fee and a per minute charge. What is the...

Use this table to answer the following questions: Text Message X2 Video Chat X2 Phone Conversation...

Use this table to answer the following questions: Text Message X2 Video Chat X2 Phone Conversation X2 4 10 5 5 8 5 5 7 4 6 5 5 5 6 6 7 7 6 6 8 5 7 8 7 5 9 6 4 8 8 n N ΣX ΣΣX X (ΣΣX)2/N Σ(X2) ΣΣ(X2) (ΣX)2/n Σ(ΣX)2/n 1. This one is tough! There are lots of steps we need to take before we can calculate the final test statistic. Let's...

Use this table to answer the following questions: Text Message X2 Video Chat X2 Phone Conversation...

Use this table to answer the following questions: Text Message X2 Video Chat X2 Phone Conversation X2 3 10 6 3 9 5 5 8 6 6 8 6 4 9 7 3 8 4 4 6 5 2 7 6 5 7 3 4 10 6 n N ΣX ΣΣX X (ΣΣX)2/N Σ(X2) ΣΣ(X2) (ΣX)2/n Σ(ΣX)2/n 1 What is the Sum of Squares (SS) between? Group of answer choices a. 95.26 b. 935.8 c. 40.9 d. 836.40 e. 28.47...

Subjects