Alex wonders if the same proportion of people are left-handed in the United States and Canada. He wants to obtain a random sample of people from each country to test if there is a significant difference between the proportion of left-handed people in each country.

Q: A recent graduate chooses 4 continents to visit from the 7 in the world. What is the size of the…

A: A recent graduate chooses 4 continents to visit from the 7 in the world total=7 choose =4

Q: Suppose 4 percent of the children in the US are thought to be near the juvenile diabetes threshold.…

A:

Q: 5. Suppose a 12 year old asked you to explain the difference between a sample and a population, how…

A: As per our guidelines, we are allowed to answer first question only. Please repost next question…

Q: A political geographer wants to use a random sample of British voters to determine if the percentage…

A: We have given that the percentage of voters supporting exit from the European Union is larger for…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: From the provided information, the hypothesis, that if two proportions, i.e., the proportion of…

Q: Wayne Gretzky was one of the ice hockey most prolific scorers when he played for the Edmonton…

A: State the hypotheses. That is, there is no evidence to conclude that the mean number of goals…

Q: When I am taking a Simple Random Sample, what do I do if say I take 23 samples from a range of 93…

A: The random number table is used to obtain the sample random sample which provides each member of the…

Q: Suppose we would like to know the difference between the true proportion of females and males who…

A: The z- test for two sample proportions can be defined as a statistical technique that can be used to…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A:

Q: The Gallup poll asks respondents how they would rate the honesty and ethical standards of people in…

A: Solution: YES. Because The percentage who rated medical doctors 'very high or high' is 65%The…

Q: To determine whether a sample should be treated as a simple random sample, which is more important:…

A:

Q: ) If the probability of a student receiving financial aid is 0.72, find the mean and variance of the…

A: Given: probability of a student receiving financial aid is 0.72 p=0.72 number of students(n)=40000

Q: State two differences between a cluster sample and a stratified random sample in this situation.

A: Sampling:      The Sample is a subset of the Population, where a sample is extracted from a…

Q: What do you mean by Random Sample?

A:

Q: Phineas Phillips, from Philadelphia, has a fascination with fun phone facts. But Phineas has…

A:

Q: The secretary in a statistics department would like to estimate how much coffee to brew per day such…

A: Solution-: Given data:  3, 4, 4, 6, 4, 6, 5, 2, 5, 3 We want to find, (a) The sample mean=? (b) The…

Q: In how many ways can a statistician select a sample of 15 people from a population of 90 people?

A: Given,A statistician select a sample of 15 people from a population of 90 people.

Q: In order manufacturer is claiming that its new 2021 SUV model will have better gas mileage than the…

A: (a) The null and alternative hypothesis is, H0:u=30H1:u>30              (right tailed/one tailed)…

Q: What is the difference between a random sample and a simple random sample

A: The difference between a random sample and a simple random sample is,Random sample:Random sample is…

Q: Kim Kardashian is interested in studying the phenomenon of selfies more deeply.  She randomly…

A: It is very difficult for the researchers to examine each of the individual units that consist in the…

Q: recent poll reports that between 53% and 59% of voters will vote for president george in the next…

A: The confidence interval is (53%, 59%).

Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: . An introductory stats professor hypothesizes that 50% of students learn best by watching the…

A: Test is that whether distribution of students is such that 50% of students learn best by watching…

Q: How can I find the sample mean of these four scores ? 1,4,4,10

A: Given data, 1,4,4,10 sample mean(x)=?

Q: For a sample of n=15 scores, how many scores are used to calculate the sample variance ?

A: Given that : For a sample of n=15 scores, how many scores are used to calculate the sample variance…

Q: What is the likely media when the mean is 9 the sample variance is 7.31 and the skew is 1.04

A: Given data:  mean  =9 sample variance  = 7.31 skew =1.04

Q: A school board would like to determine whether there is a difference in average SAT scores for…

A: Paired data is used when experimental Unit is same on which two different treatment are apllied

Q: For the year 2005, the demand for a popular childrens board game was Normally distributed with an…

A: Given ,sample size (n)=15sample mean(x)=225standard deviation(s)=25population mean(μ)=200

Q: On election day, a local TV news organization stayed at three polling locations in Fairfield county…

A: Given:  The total number of votes for candidate A in the election for the US Senate seat are n=2790.…

Q: Why a casual or haphazard sample doesn’t qualify as a random sample?

A: Haphazard or casual sampling is where we try to create a random sample by haphazardly or casually…

Q: allup poll asks respondents how they would rate the honesty and ethical standards of people in…

A: In the given problem, it is given that the The proportion of respondents who gave a rating for a…

Q: The CEO of an airline estimates that 15% of all flights arrive late. How many flights must he…

A: Given Information: Proportion p=0.15 Confidence level = 96% = 0.96 Significance level α=1-0.96=0.04…

Q: Why can we consider the sample mean in random samples of size n from a given population to be a…

A: We consider the sample mean in random samples of size n from a given population to be a random…

Q: One study found a negative correlation between participant’s age and hours of sleep they got (as…

A: The strength and direction of linear relationship between two variables is measured by correlation.…

Q: A telecommunications company knows that 90% of their customers own smart phones. Ten customers are…

A: Let "X" be the customers who own smartphones. The variance of the binomial distribution is given by

Q: In a survey,  55% of the voters support a particular referendum. If 40 voters are chosen at random,…

A: Given that, 55% of the voters support a particular referendum.  Sample size = 40

Q: You randomly selected one sample of 40 citizens of your city to see if they wanted to increase taxes…

A: See the solution

Q: The reason why samples are selected at random is

A: We know that  Random sampling :  Selecting a sample randomly from the population . By selecting…

Q: . Suppose the proportion of American adults who work at home is 40%. For a random sample of 100…

A: Solution-: Given: n=100, P=0.40 (Population proportion) Let, p^- be the sample proportion

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: (a): Null hypothesis H0: proportion of rural areas = proportion of metropolitan areas H1: proportion…

Q: A statistics class is made up of 12 men and 18 women. What percentage of the class is​ male?

A: Given,no.of mens=12no.of womens=18total no.of peoples=30

Q: if the population mean is 12.45 what is the mean of the sampling distribution of its means?

A: Given : Population mean(μ) =  12.45

Q: Define random variations?

A: The question is about time series analysis Introduction : Time Series : It is a statistical…

Q: what happens to the mean as the sample size increases?

A: It is given that the sample size is increasing.

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.