A brokerage survey reports that 29 % of all individual investors have used a discount broker (one that does not charge the full commission). If a random sample of 90 individual investors is taken, approximate the probability that at most 28 have used a discount broker. Use the normal approximation to the binomial with a correction for continuity. Round your answer to at least three decimal places. Do not round any intermediate steps.

Q: The mean percent of childhood asthma prevalence in 43 cities is 2.27​%. A random sample of 33 of…

A: Given : μ = 2.27 , σ= 1.27 and n= 33 By Central Limit Theorem, x̅ follows a Normal distribution…

Q: A charity holds a raffle in which each ticket is sold for $45. A total of 9600 tickets are sold.…

A: We have the following information: Each ticket sold for $45. Total no. of ticket sold = 9600. The…

Q: d. If 100 SAT scores are randomly selected, find the probability that they have a mean between 1400…

A: d. Z-score: The z score formula is, z=x¯-μx¯σx¯ In the formula, μx¯ is the population mean, σx¯ is…

Q: f 9% of all cars fail the emissions inspection, find the probability that in a sample of 125 cars,…

A: Given: 9% of all cars fails the emission inspection (p=0.09) n=125 P(X=16)=?

Q: According to a recent survey, 80% of all teenagers own a smartphone. If we select 10 teenagers at…

A:

Q: Alison Bender works for an accounting firm. To make sure her work does not contain errors, her…

A:

Q: A group of people were asked if they had run a red light in the last year. 206 responded "yes", and…

A:

Q: The probability that the return will be below X% is approx. 0.16. What is the value of X for Stock…

A: We are given:p = 0.16 (probability of return being below X%)For Stock A and Stock B:X = (1 - p) *…

Q: O O O A social media survey found that 71% of parents are "friends" with their children on a certain…

A: As per the Bartleby guildlines we have to solve first three subparts and rest can be reposted....…

Q: An unfair coin is tossed 14 times.  This coin is known to come up heads 60% of the time and tails…

A: Here, n = 14, p = 0.40, q = 0.60.

Q: Assume that when adults with smartphones are randomly selected 52% use them in meetings or classes.…

A:

Q: A set of 150 independent patients take anti-acid medication at the start of symptoms, and 80…

A: Solution

Q: A group of people were asked if they had run a red light in the last year. 262 responded "yes", and…

A:

Q: group of people were asked if they had run a red light in the last year. 467 responded "yes", and…

A: Total people = 467 + 376 =843

Q: Attorneys often use lie detectors to test if a suspect is speaking the truth or not. It is found…

A:

Q: When treated with an antibiotic, 93% of all the dolphins are cured of an ear infection. If a group…

A:

Q: The United States Bureau of Labor Statistics (BLS) conducts the Quarterly Census of Employment and…

A: Obtain the probability that the mean taxable wages in James sample of 54 counties will be less than…

Q: In a large population, 66% of the people have been vaccinated. If 4 people are randomly selected,…

A:

Q: On a five-day vacation, the forecast is a 75%75% chance of rain every day. What’s the probability…

A: probability mass function of B.D is = f ( k ) = ( n  k ) p^k * ( 1- p) ^ n-kwhere       k = number…

Q: Suppose that you are offered the following "deal." You roll a six sided die. If you roll a 6, you…

A: Suppose that you are offered the following "deal." You roll a six sided die. If you roll a 6, you…

Q: A machine produces a defective item 8 % of the time.  A customer purchases a box of 60 of these…

A: Solution :  Given : p= 0.08             n = 60  Let, X : Number of defective items Here X ~ B (…

Q: A subway train arrives every eight minutes during rush hour. We are interested in the length of time…

A: The question is about continuous prob. distribution Given : The length of time a commuter must wait…

Q: Suppose that you are offered the following "deal." You roll a six sided die. If you roll a 6, you…

A: Given : If 6 comes, 18$ win If 4 or 5 comes, 4$ win Lose 5$ if anyother outcomes.

Q: A group of people were asked if they had run a red light in the last year. 146 responded "yes", and…

A: According to the given information, we have Total number of people = 146+112 = 258 146 responded…

Q: Suppose the time a child spends waiting at for the bus as a school bus stop is exponentially…

A:

Q: George is a big fan of music from the 1960s, and 22% of the songs on his iPod are Beatles songs.…

A: Given that  Population proportion p=22%=0.22 Sample size n =50

Q: Based on a poll, among adults who regret getting tattoos, 13% say that they were too young when they…

A: Given : Based on a poll , among adults who regret getting tattoos , 13% say that they were too young…

Q: An earth-conscious clothing store offers a 15% discount if you bring in a bag full of old clothing…

A: From the given information, n=20 and p=0.69.

Q: group of people were asked if they had run a red light in the last year. 214 responded "yes", and…

A:

Q: A group of people were asked if they had run a red light in the last year. 210 responded "yes", and…

A: The probability of an event A can be found using the formula: PA=nFnT Here,  nF is the number of…

Q: Assume that when adults with smartphones are randomly selected, 45% use them in meetings or classes.…

A: N=9P= 0.45

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.