Question

In: Statistics and Probability

In 2018, 43% of American households still had a landline phone. A random sample of 12...

In 2018, 43% of American households still had a landline phone.

A random sample of 12 households is selected.

a) Find the probability that the sample contains exactly 4 households with a landline.

b) Find the probability that at least one household has a landline.

c) Find the mean and standard deviation for the number of households with a landline.

Solutions

Expert Solution

orchestra answered 2 years ago
Next > < Previous

Related Solutions

In a representative sample of 50 American households, 32 households had a pet. Use this sample...
In a representative sample of 50 American households, 32 households had a pet. Use this sample data to answer the following questions. A. Use Minitab Express to construct a 95% confidence interval to estimate the proportion of all American households with a pet. Show how you checked assumptions. If assumptions were met, use the normal approximation method. Remember to include all relevant Minitab Express output and to clearly identify your answer. Other than checking assumptions, do not do any hand...
In a representative sample of 50 American households, 32 households had a pet. Use this sample...
In a representative sample of 50 American households, 32 households had a pet. Use this sample data to answer the following questions. A. Use Minitab Express to construct a 95% confidence interval to estimate the proportion of all American households with a pet. Show how you checked assumptions. If assumptions were met, use the normal approximation method. Remember to include all relevant Minitab Express output and to clearly identify your answer. Other than checking assumptions, do not do any hand...
In 2015, 45% of Americans had only a cell phone (and no landline). A research firm...
In 2015, 45% of Americans had only a cell phone (and no landline). A research firm plans to investigate whether this percentage has changed in the meantime. In a recent sample of 1252 people, 613 reported having only a cell phone. Fill in the blanks: H0:p=________ and Ha:p ? __________ Calculate p? Are both np0 and (1-p0)at least 15? Show the calculations. Draw a bell (normal) curve with the mean and two standard errors (in both directions) marked. Mark p?...
It is reported that 25% of American households use a cell phone exclusively for their telephone...
It is reported that 25% of American households use a cell phone exclusively for their telephone service. In a sample of eleven households, find the probability that:    (a) None use a cell phone as their exclusive service. (Round your answer to 4 decimal places.)      Probability (b) At least one uses the cell exclusively. (Round your answer to 4 decimal places.)      Probability (c) At least five use the cell phone. (Round your answer to 4 decimal places.)   ...
Confidence Intervals In a random sample of 1100 American adults it was found that 320 had...
Confidence Intervals In a random sample of 1100 American adults it was found that 320 had hypertension (high-blood pressure). The US Department of Health and Human Services (HHS) wants the population proportion of hypertension to 16% by 2022. Find the 95% confidence interval for the proportion of all adult Americans that have hypertension. Interpret the confidence interval in the words of the problem. Find the error bound. Does this data and analysis provide evidence that the population proportion of hypertension...
In 2018 a random sample of 1,200 American adults was asked the question, “What do you...
In 2018 a random sample of 1,200 American adults was asked the question, “What do you think is the ideal number of children for a family to have?” Results showed that 40% of respondents said three or more children is ideal. I. Calculate a 95% confidence interval for the proportion of Americans who think that three or more children is the ideal family size. The multiplier for a 95% confidence interval is 1.960. Give your answer to 4 decimal places....
Question 12 A simple random sample of 12 e-readers of a certain type had the following...
Question 12 A simple random sample of 12 e-readers of a certain type had the following minutes of battery life. 287, 311, 262, 392, 313, 263, 293, 316, 286, 301, 287, 291 Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 62. What is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type? Round your answer to one decimal places (for...
In 2012, seventy percent of Canadian households had an internet connection. A sample of 484 households...
In 2012, seventy percent of Canadian households had an internet connection. A sample of 484 households taken in 2013 showed that 75% of them had an internet connection. We are interested in determining whether or not there has been a significant increase in the percentage of the Canadian households that have internet connections. Please design your hypothesis test (2 points), conduct the test (2 points ) and draw your conclusion accordingly (1 point)
A random sample of 73 firms in an industrial area indicated that 12 of them had...
A random sample of 73 firms in an industrial area indicated that 12 of them had handled their industrial waste incorrectly for disposal. Test to see if the proportion of firms handling their industrial waste incorrectly for disposal is significantly lower than an assumed 20% overall. Use a 3% significance level.
According to the 2018 American Community Survey, 80% of the 120 million households in the US...
According to the 2018 American Community Survey, 80% of the 120 million households in the US have broadband Internet subscriptions. Consider drawing a random sample of n = 256 households from all households in the US. Let p̂ denote the sample proportion of households that have broadband Internet subscriptions. a) State the mean, standard deviation, and the approximate shape for the sampling distribution of p̂ . b) Based on your answer in part a, what is the approximate probability that...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT