Question

In: Statistics and Probability

6. A research firm conducted a survey to determine the mean amount steady smokers spend on...

6. A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found that the distribution of amounts spent per week followed a normal distribution with a standard deviation of $5. A sample of 49 steady smokers revealed a mean of $20

a) What is the point estimate for the population mean?

b) Using the 95% level of confidence, determine the confidence interval for the population mean.

c) Determine the 85% confidence interval for the population mean.

Solutions

Expert Solution


Related Solutions

A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes...
A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found the distribution of amounts spent per week, followed the normal distribution with the standard deviation of $5. A sample of 49 steady smokers reveal that mean=20. a). What is the point estimate of the population mean? explain what it indicates b). using the 95% level of confidence. determine the confidence interval for sample mean. explain what it indicates
A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes...
A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. The population mean is $25 and the population standard deviation is $15. What is the probability that a sample of $100 steady smokers spend between $24 and $26? a. 0.495 b. 0.252 c. 0.248 d. 0.748
The research firm conducted a survey to determine the average mean amount of money smokers spend...
The research firm conducted a survey to determine the average mean amount of money smokers spend on cigarettes per week. A sample of 19 smokers reveals a mean and standard deviation of $20 and $5 respectively. find the intercept the 99% confidence interval for the mean.
A research team conducted a survey in which the subjects were adult smokers. Each subject in...
A research team conducted a survey in which the subjects were adult smokers. Each subject in a sample of 200 was asked to indicate the extent to which he or she agreed with the statement. “I would like to quit smoking”. The results were as follows. Strongly Agree: 102 Agree: 30 Disagree: 60 Strongly disagree: 8 Can one conclude on the basis of these data that, in the sampled population, opinions are not equally distributed over the four levels of...
A market research company conducted a telephone survey of 255 Melbourne households to determine the proportion...
A market research company conducted a telephone survey of 255 Melbourne households to determine the proportion of households seeking to purchase a new car in the next two years. An interval estimate of 0.151 to 0.289 was calculated. Determine the level of confidence (answer as percentage correct to two decimal places).
A market research company conducted a telephone survey of 320 Melbourne households to determine the proportion...
A market research company conducted a telephone survey of 320 Melbourne households to determine the proportion of households seeking to purchase a new car in the next two years. An interval estimate of 0.134 to 0.196 was calculated. Determine the level of confidence (answer as percentage correct to two decimal places).
The Humber Student Federation conducted a survey to determine the mean study time/week of students at...
The Humber Student Federation conducted a survey to determine the mean study time/week of students at the Lakeshore Campus. A sample of 18 students had a mean of 7.5 hours and a standard deviation of 2.2 hours. Assuming that the sampling distribution is about normal, calculate a 99% confidence interval for the mean study time all students at the Lakeshore Campus.
An international biotech firm conducted a survey to determine the value of new business created over...
An international biotech firm conducted a survey to determine the value of new business created over the last month in millions of dollars. From 23 responses, the mean and standard deviation were found to be $3.129 and $0.534 million respectively. Assuming the data were collected through a random sample and that the value of new business created per month is approximately normally distributed, calculate a 95% confidence interval estimate of the average value of new business created per month in...
3. [8 marks] Suppose a survey is conducted by Ipsos, a Canadian market research polling firm,...
3. [8 marks] Suppose a survey is conducted by Ipsos, a Canadian market research polling firm, on user satisfaction with cell phone coverage across the country. They sample 10 customers at random without replacement. Assume all sampled customers are independent. Suppose 30% of users nationwide are satisfied with their cell phone coverage. a) [5 marks] Calculate the probability that 3 or more of the 10 randomly sampled cell phone customers are satisfied with their cell phone coverage. b) [1 mark]...
A recent survey was conducted to determine how people consume their news. According to this​ survey,...
A recent survey was conducted to determine how people consume their news. According to this​ survey, 60​% of men preferred getting their news from television. The survey also indicates that 42​% of the sample consisted of males. ​ Also, 42​% of females prefer getting their news from television. Use this information to answer the following questions. a. Consider that you have 30000 ​people, given the information​ above, how many of them are​ male? b. Again considering that you have 30000...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT