Assume that 100 births are randomly selected and 51 of the births are girls. Use subjective...

Assume that 100 births are randomly selected and 51 of the births are girls. Use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high.
In a survey of consumers aged 12 and older, respondents were asked how many cell phones were in use by the household. (No two respondents were from the same household.) Among the respondents, 207 answered "none," 298 said "one," 365 said "two," 138 said "three," and 104 responded with four or more. A survey respondent is selected at random. Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to have four or more cell phones in use? Consider an event to be unlikely if its probability is less than or equal to 0.05.

5. The table below displays results from experiments with polygraph instruments. Find the positive predictive value for the test. Thatis, find the probability that the subject lied, given that the test yields a positive result.

Did the Subject Actually Lie?

No (Did Not Lie) Yes (Lied) Positive test results 11, 45 Negative test results 33, 12

The probability is?

(Round to three decimal places as needed.)

8. Assume that when adults with smartphones are randomly selected, 58% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that fewer than 4 of them use their smartphones in meetings or classes.

(Round to four decimal places as needed.)

9. Based on a poll, among adults who regret getting tattoos,

21% say that they were too young when they got their tattoos. Assume that six adults who regret getting tattoos are randomly selected and find the indicated probability. Complete parts (a) through (d) below.

Find the probability that none of the selected adults say that they were too young to get tattoos.
Find the probability that exactly one of the selected adults says that he or she was too young to get tattoos.
Find the probability that the number of selected adults saying they were too young is 0 or 1.
If we randomly select 6 adults, is 1 significantly low number who say that they were too young to get tattoos?

Expert Solution

orchestra answered 2 years ago

Assume 100 people are randomly selected from cell phone ownership rolls. Using subjective judgment, describe the...

Assume 100 people are randomly selected from cell phone ownership rolls. Using subjective judgment, describe the number of females observed as being (a) significantly low, (b) significantly high, or (c) neither significantly low nor significantly high. Item 1. If 33 females are randomly selected, what is your judgment on this outcome? Item 2. If 98 males are randomly selected, what is your judgment on this outcome? For your response, please type each letter answer separated by a comma. For example,...

Listed below are weights (hectograms or hg) of randomly selected girls at birth. Use the sample...

Listed below are weights (hectograms or hg) of randomly selected girls at birth. Use the sample data to construct a 95% confidence interval for the mean weight of girls. 33 28 33 37 31 32 31 28 43 28 33 26 30 31 28 Address the following questions: What is alpha What is Zα/2 or tα/2 Which formula did you use and what is the Confidence Interval?

Use the given categorical data to construct the relative frequency distribution. Natural births randomly selected from...

Use the given categorical data to construct the relative frequency distribution. Natural births randomly selected from four hospitals in a highly populated region occurred on the days of the week (in the order of Monday through Sunday) with the frequencies 52, 64, 72, 55, 57, 45, 55. Does it appear that such births occur on the days of the week with equal frequency? Construct the relative frequency distribution. Day Relative frequency Monday ___% Tuesday ___% Wednesday ___% Thursday ____% Friday ...

Records of randomly selected births were obtained and categorised based on the day of the week...

Records of randomly selected births were obtained and categorised based on the day of the week the birth occurred, which is provided below. Since babies are unaware of the tradition work week, it would be reasonable to assume the distribution of births would occur equally on each of the days of the week. At 1% level of significance, test the claim. Can you think of an explanation for the result? Day Sunday Monday Tuesday Wednesday Thursday Friday Saturday Number of...

When two births are randomly selected, the sample space for genders is bb, bg, gb, and...

When two births are randomly selected, the sample space for genders is bb, bg, gb, and gg. Assume that those four outcomes are equally likely. Construct a table that describes the sampling distribution of the sample proportion of girls from two births. Does the mean of the sample proportions equal the proportion of girls in two births? Does the result suggest that a sample proportion is an unbiased estimator of a population proportion? For the entire population, assume the probability...

- Assume that when adults with smartphones are randomly selected, 65% use them in meetings or...

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Use the population {3,4,6} and assume that samples of size 2 are randomly selected, with replacement....

Use the population {3,4,6} and assume that samples of size 2 are randomly selected, with replacement. ?) For the population, find the proportion of odd numbers ?) Construct a table for the sampling distribution of the sample proportions of odd numbers. ?) Find the mean of the sampling distribution of the sample proportion of odd numbers. ?) Is the sample proportion an unbiased estimator or a biased estimator of the population proportion? why?

Assume that when adults with smartphones are randomly selected, 44 % use them in meetings or...

Assume that when adults with smartphones are randomly selected, 44 % use them in meetings or classes. If 14 adult smartphone users are randomly selected, find the probability that exactly 5 of them use their smartphones in meetings or classes.

use the population {3,4,6} and assume that samples of size 2 are randomly selected, with replacement....

use the population {3,4,6} and assume that samples of size 2 are randomly selected, with replacement. a) for the population, find the proportion of odd numbers. b) construct a table for sampling distribution of the sample proportion of odd numbers. c) find the mean of sampling distribution of the sample proportion of odd numbers. d) is the sample proportion and unbiased estmator or. biased estimator of the population? Why?

assume that when adults with smart phones are randomly selected, 54% of them and use them...

assume that when adults with smart phones are randomly selected, 54% of them and use them in meetings. If 12 adult smartphone users are randomly selected, find the probability that fewer than 4 of them use their smart phones in meetings or classes.

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