(b) No

asked 2021-08-09

Based on a smartphone survey, assume that 41% of adults with smartphones use them in theaters. In a separate survey of 275 adults with smartphones, it is found that 112 use them in theaters. a. If the 41% rate is correct, find the probability of getting 112 or fewer smartphone owners who use them in theaters. b. Is the result of 112 significantly low?

asked 2020-10-21

Assume that when adults with smartphones are randomly selected, 54% use them in meetings or classes (based on data from an LG Smartphone survey). If 8 adult smartphone users are randomly selected, find the probability that exactly 6 of them use their smartphones in meetings or classes.

asked 2021-08-08

A) Read carefully the text and provide each of the following:

The sample size \(\displaystyle?=\)

from the sample, the number of college students who own a car is \(\displaystyle?=\)

the confidence level is \(\displaystyle{C}{L}=\) \(\displaystyle\%\).

B) Find the sample proportion \(\displaystyle\hat{{?}}=\)

and \(\displaystyle\hat{{?}}={1}−\hat{{?}}=\)

asked 2021-05-17

You want to invest money for your child's education in a certificate of deposit (CD). You want it to be worth \($12,000\) in 10 years. How much should you invest if the CD pays interest at a \(9\%\) annual rate compounded

a) Annually?

b) Continuously?

a) Annually?

b) Continuously?

asked 2020-11-27

Assume that when adults with smartphones are randomly selected, 46% use them in meetings or classes. If 20 adult smartphone users are randomly selected, find the probability that exactly 15 of them use their smartphones in meetings or classes.

asked 2021-08-06

a) Calculate a confidence interval at the \(\displaystyle{99}\%\) confidence level for the proportion of all adult Americans who believe in astrology. (Round your answers to three decimal places.)

(_______, _______)

b) What sample size would be required for the width of a \(\displaystyle{99}\%\) CI to be at most 0.05 irresoective of the value of \(\displaystyle\hat{{{p}}}\)? (Round your answer up to the nearest integer.)

asked 2021-08-02

Ben and Carl are remembering how you told them that a 0 at the end of a whole number makes it ten times greater. They remember that 420 is ten times bigger than 42, for example. They wonder if the same thing works with decimals. Ben argues that putting a 0 at the end of a decimal number makes it ten times greater. Carl says, "No. You've gotta sneak it in right after the decimal point and push everything to the right." How do you help them to see what's true and what's not?