Coffee Talk A study on the enhancing effect of coffee on long-tenn memory found that 35 participants given 200 mg of caffeine performed better on a memory test 24 hours later compared to the placebo group that received no caffeine. a. There was a probability of 0.049 that the difference between the coffee group and the placebo group was due to chance. What do you conclude? b. A group given a higher dose of 300 mg performed better than the 200 mg group, with a probability of 0.75 that this difference is due to chance. What do you conclude?

Q: .What type of error did you make

A: Type 1 error is known to be a false positives. Type 2 error is known to be a false negatives.

Q: cles were cars, and the rest were pickups or obabilit cain year, 45.3% of all that a severe…

A: Let Probability of car = P(c) = 45.3% = 0.456 Probability of car or SUV = P(s) = 1 - 0.453 = 0.547

Q: In auction bidding, the "winner's curse" is the phenomenon of the winning (or highest) bid price…

A: X1=24, n1=172 X2=36, n2=138 p1cap=X1/n1, p2cap=X2/n2

Q: The following table describes the results of roadworthiness tests of Ford Focus cars that are three…

A: x P(x) 0 0.377 1 0.399 2 0.176 3 0.041 4 0.005 5 0+ 6 0+

Q: A study on the age distribution of students at a community college yielded the following data: What…

A: We know, the sum of probabilty of any distribution is 1. Let the probabilty of randomly selected…

Q: A study of breast cancer in postmenopausal women included 500 cases of invasive breast cancer and…

A:

Q: A recent study on the factors of diabetes finds that 95% of those who drink soda on a daily basis…

A: Event: In probability theory, an event is an outcome or a set of outcomes of a random experiment to…

Q: People are poor at making judgments about probability. One source of error in judgment of…

A: Given,      Introduction                     In the city where the accident occurred, 85% of cabs…

Q: In a very small town, the mayor was considering reinstating capital punishment. A local TV station…

A: We have to find given probability.

Q: A certain genetic abnormality occurs in roughly 4% of the population. A bloodtest will detect the…

A: The objective of this question is to find the probability that a person has a genetic abnormality…

Q: An opinion poll asks a sample of 1000 adults whether they favor giving vouchers for education. If…

A: From the provided information, Sample size of adults (n) = 1000 48% of the population favours the…

Q: If the level of significance is .01, the chance (probability) of making a Type I error is 01.1%…

A: Given that  Level of significance = 0.01

Q: In fact, 16 of the tests were significant at the 5% level and 6 tests were significant at the 1%…

A: 1)  Number of Expected Significance tests at 0.05 level is: 48*0.05 =  2.4   Number of Significant…

Q: In an experiment, we are observing patients at a doctor's office. On average, the doctor sees 10…

A: Let x be doctor spends time with patients10 patients/hour=6/minutes

Q: A Food Marketing Institute found that 28% of households spend more than $125 a week on groceries.…

A: given data  p (spend more than $125) = p = 0.28 n = 235 P(p^<0.31) = ?

Q: Pick the equation most appropriate to deal with the problem above. p(r) = p (1 – p)"- O p(z) = „C,p²…

A: Givenp=0.82n=80x~Binomial(n=80,p=0.82)

Q: A national survey of 1600 adult citizens of a nation found that 22% dreaded Valentine's Day. The…

A:

Q: A naturalist whale watch trips every morning in March. The number of whales seen has a mean of 4.1.…

A:

Q: An actuary studied the likelihood that different types of drivers have at least one collision during…

A: To find: The probability that a driver with at least one collision in the past year is a Teen…

Q: an experimental drug has been shown to be 75% effective in eliminating symptoms of allergies in…

A:

Q: According to a study done by the pew Research Center, 36% of adult Americans believe that marriage…

A: Given Information: 36% of adult Americans believe that marriage is now obsolete i.e., p=0.36 Sample…

Q: A researcher conducts a hypothesis test and obtains a p-value of 0.023 for an odds ratio of 3.44.…

A: P-value = 0.023  with an odds ratio of 3.44.Want to state whether the given statement is true or…

Q: 5.8 It has been reported that about 35% of U.S. adults attended a sports event during the previous…

A:

Q: Detecting Fraud The Brooklyn District Attorney’s office analyzed the leading (leftmost) digits of…

A: a)Define the random variable x as the number of checks with the leading digit as 1. Here, the number…

Q: Wi-Fi Based on a poll conducted through the e-edition of  USA Today , 67% of Internet users are more…

A: In this context, the probability that the internet users are more careful about the personal…

Q: A student was interested in investigating whether female or male students at her school tend to have…

A: The objective of the question is to interpret the boxplots of reaction times for male and female…

Q: Determine whether the results appear to have statistical? significance, and also determine whether…

A: The sample size is , The number of favorable cases is The significance level is

Q: What is the variance of the number of blowouts experienced by the 15 trucks?

A:

Q: Lefties Although it’s hard to be definitive in classify-ing people as right- or left-handed, some…

A: Given info: There is 14% of the people are left-handed. The multiplication rule suggest that there…

Q: 1,000 randomly selected business executives were polled. Assume that 25 percent of all business…

A: Answer:In this question, it has given thatX ~ Bin(1000,0.25)Calculation of mean and variance :Mean =…

Q: probability

A: Consider the following events, According to the given problem,

Q: An early study found that postal workers who worked in the office had higher rates of coronary heart…

A: a)  Chance: is defined as the occurrence of events without the presence of any obvious intention or…

Q: Determine whether the results below appear to have statistical significance, and also determine…

A:

Q: An automaker is concerned about the possible recall of its best-selling four-door sedan. If there is…

A: we have to find the probability that the defect is in the brakes or in the fuel system if the…

Q: (a) What is the estimated probability that a randomly selected customer downloads three or fewer…

A: (a) The estimated probability that a randomly selected customer downloads three or fewer songs is,…

Q: Air Bag Safety According to a study conducted by the a public health school, a child seated in the…

A: Let the probability that the child gets killed in an accident when the airbags did not deploy be x.…

Q: Determine whether the results below appear to have statistical significance, and also determine…

A: Given data In a study of weight loss program 5 subjects lost an average of 50 lbs. It is found that…

Q: a. What is the probability that a randomly-selected patient is obese or is diagnosed with…

A: It is given that Total = 219 Number of Obese = 90 Number of hypertension = 73 Number of Obese and…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.