3-The following data were collected in a survey of 8th graders and summarize their cell phone...

3-The following data were collected in a survey of 8th graders and summarize their cell phone status.

	No cell phone	Conventional cell phone user	Smart phone user
Boys	55	65	35
Girls	31	78	27

a) What proportion of the 8th graders have cell phones?

b) What proportion of the boys do not have cell phones?

c) What proportion of smart phone users are boys?

Expert Solution

TOPIC:Conditional law and Classical definition of probability.

milcah answered 5 hours ago

Using the data in the Excel file Cell Phone Survey, determine if the mean response for...

Using the data in the Excel file Cell Phone Survey, determine if the mean response for Customer Service rating is different for the carriers (consider only AT&T, Verizon, and Sprint) for significance level of 5%. Gender Carrier Type Usage Signal strength Value for the Dollar Customer Service M AT&T Smart High 5 4 4 M AT&T Smart High 5 4 2 M AT&T Smart Average 4 4 4 M AT&T Smart Very high 2 3 3 M AT&T Smart Very...

A research report indicated that in 2018, 59% of all 6th graders owned a cell phone....

A research report indicated that in 2018, 59% of all 6th graders owned a cell phone. A random sample of 151 6th graders is drawn. Is it appropriate to use the normal approximation for this situation? Why or why not? Find the probability that the sample proportion of 6th graders who own a cell phone is more than 64.5%. (Find P(p > 0.645)). Calculate the probability that the sample proportion of 6th graders who own a cell phone is between...

The following data were collected from a survey of 10 randomly selected college students: Find the...

The following data were collected from a survey of 10 randomly selected college students: Find the mean, median, mode, variance, standard deviation, the five number summary report of the hours per week of the sample of students’ studied. Show your work. Student ID Facebook # hours of study per week 244701130 Yes 8 302896051 no 5 734077249 yes 11 891072704 yes 5 730265917 yes 9 894866913 no 6 644678646 no 1 369417477 yes 1 388511718 yes 2 554470987 no 1

Why are cell phone data plans cheaper in Europe? Why might cell phone data plans have...

Why are cell phone data plans cheaper in Europe? Why might cell phone data plans have different prices across markets?

In a large survey, third graders were asked what their favorite color is. The results are...

In a large survey, third graders were asked what their favorite color is. The results are in the table below. Color Red Blue Yellow Pink Green Orange Relative Frequency 14% 25% 18% 20% 13% 10% Suppose that 10 randomly selected students are chose. What is the probability that 3 students say blue is their favorite color?

In the Cell Phone Survey below, test the hypothesis that the mean responses for Value for...

In the Cell Phone Survey below, test the hypothesis that the mean responses for Value for the Dollar and Customer Service do not differ by gender. Gender Carrier Type Usage Signal strength Value for the Dollar Customer Service M AT&T Smart High 5 4 4 M AT&T Smart High 5 4 2 M AT&T Smart Average 4 4 4 M AT&T Smart Very high 2 3 3 M AT&T Smart Very high 5 5 2 M AT&T Smart Very high...

You have collected information on the brand of cell phone owned by 100 students. Which of...

You have collected information on the brand of cell phone owned by 100 students. Which of the following visualizations should not be used on this type of data? Histogram Bar chart Pie chart Stacked column chart I have collected data and for one of my variables, the mean is 100, the median is 90 and the mode is 80. What shape is the distribution of this variable? Symmetric Right skewed Left skewed You have recorded the level of traffic on...

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.

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

in a study of cell phone use and brakn hemispheric dominance, an internet survey was emailed to 2319 subjects randomly selected from an online group involved with ears. 1022 surveys were returned. construct a 95% confidence interval for the proportion of returned surveys A. find the best point estimate of the populatiom proportion p B. identify the value of the margin of error E C. construct the confidence interval

Question