10-) Assume that when adults with smartphones are randomly selected, 58% use them in meetings or classes. If 15 adult smartphone users are randomly selected, find the probability that fewer than 5 of them use their smartphones in meetings or classes.

The probability is

enter your response here.

(Type an integer or decimal rounded to four decimal places as needed.)

13-) The overhead reach distances of adult females are normally distributed with a mean of 205cm and a standard deviation of 7.8cm.

a. Find the probability that an individual distance is greater than 215.00 cm.

b. Find the probability that the mean for 15. randomly selected distances are greater than 203.20cm.

a. The probability is

enter your response here.

(Round to four decimal places as needed.)

b. The probability is

enter your response here.

(Round to four decimal places as needed.)

14-) The overhead reach distances of adult females are normally distributed with a mean of 205cm and a standard deviation of 8.6cm.

a. Find the probability that an individual distance is greater than 215.00cm.

b. Find the probability that the mean for 15 randomly selected distances is greater than 203.50cm.

a. The probability is

enter your response here.

(Round to four decimal places as needed.)

b. The probability is

enter your response here.

(Round to four decimal places as needed.)

17-) A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 330 babies were born, and 297 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective?

(Round to three decimal places as needed.)

Does the method appear to be effective?

Yes, the proportion of girls is significantly different from 0.5.

No, the proportion of girls isnot significantly different from 0.5.

18)

Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. The results in the screen display are based on a 95% confidence level. Write a statement that correctly interprets the confidence interval.	Tlnterval
(13.046,22.15) x=17.598 Sx=16.01712719 n=50

Choose the correct answer below.

A.

We have 95% confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports.

B.

We have 95% confidence that the limits of 13.05 Mbps and 22.15 Mbps contain the sample mean of the data speeds at the airports.

C.

The limits of 13.05 Mbps and 22.15 Mbps contain the true value of the mean of the population of all data speeds at the airports.

D.

The limits of 13.05 Mbps and 22.15 Mbps contain 95% of all of the data speeds at the airports.

19-)Use the given information to find the number of degrees of freedom, the critical values 2L and 2R, and the confidence interval estimate of . It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 80%

confidence;

n=25,

s=0.25

mg.

LOADING...

Click the icon to view the table of Chi-Square critical values.

df=enter your response here

(Type a whole number.)

2L=enter your response here

(Round to three decimal places as needed.)

2R=enter your response here

(Round to three decimal places as needed.)

The confidence interval estimate of

is

enter your response here

mg<

mg.

(Round to two decimal places as needed.)

21-) Claim: Fewer than 93% of adults have a cell phone. In a reputable poll of 1036 adults, 83% said that they have a cell phone. Find the value of the test statistic.

The value of the test statistic is

enter your response here.

(Round to two decimal places as needed.)

22-) Claim: The standard deviation of pulse rates of adult males is lessthan 11bpm. For a random sample of 144 adult males, the pulse rates have a standard deviation of 10.2 bpm. Find the value of the test statistic.

The value of the test statistic is

enter your response here.

(Round to two decimal places as needed.)