A car wash is assessing the average wait time for its customers. The median wait time is 4 minutes. Does a customer who waits for 5 minutes represent an abnormal wait time? The customer who waits 5 minutes an abnormal case, because 50% of customers wait more than minutes. represents does not represent

Q: Find the third quartile for the average number of Facebook friends.

A: Let X denote the average number of Facebook friends users. Given that X ~ N(mean=122, SD=43) Let Q3…

Q: What is the test statistic?

A: At Rachel's 11th birthday party, B-girls were timed to see how long ( in seconds ) they could hold…

Q: Test the claim that the proportion of people who own cats is larger than 90% at the 0.01…

A: Given claim: The proportion of people who own cats is larger than 90%. Null Hypothesis: H0:…

Q: the

A: Effect size is defined as the way of quantifying the difference between the two groups.

Q: An oil company conducts a geological study that indicates that an exploratory oil well should have a…

A: Given that  n=5 , p=20%=0.20 , q=1-p=1-0.20=0.80 X~Binomial(n=5,p=0.20) p=probability of chance of…

Q: Test the claim that the proportion of people who own cats is larger than 20% at the 0.05…

A: Claim : Proportion of people who own cats is larger than 20% = 0.2 Sample size is n = 300 Sample…

Q: which statistic is equivalent to dividing the sum of scores equally across all members of a sample

A: The statistic measures the characteristics of samples to estimate the population.

Q: The z for a sample mean hypothesis test compares a sample mean to another mean. In these situations,…

A: From the above data We are given that the The z for a sample mean hypothesis test compares a…

Q: A political scientist claims that 38% of first-year college students characterize themselves as…

A: The hypothesized proportion is 0.38, n=500 and x=215.

Q: Test the claim that the proportion of people who own cats is larger than 50% at the 0.025…

A: Let p denotes the population proportion of people who owns cats. The claim of the test is that the…

Q: f a research study reports a very borderline significance level, just a very small amount outside of…

A:

Q: Does the one observed sample mean qualify as a common or a rare outcome? Explain.

A: Sample mean qualify as a common outcome if the difference between the sample mean and the actual or…

Q: Explain why you should get a much better prediction for μ by using x from a sample size n rather…

A: The confidence interval on mean is given as x-Zα2sdn≤μ≤x-Zα2sdn where  μ=population meanx=sample…

Q: Past records indicate that 45% of students eat breakfast while driving to school. A campaign to…

A: Solution: State the hypotheses Null hypothesis: That is, the proportion of students eats breakfast…

Q: Stacy conducts a study to look at the effects of season (fall, winter, spring, summer) and type of…

A: Two way ANOVA:   From the given information, the data view of the given variables is,     fall…

Q: It is defined as the maximum likely difference between the observed sample mean and the true value…

A: Here  Sampling Error is defined as the maximum difference between observed sample mean and…

Q: Test the claim that the proportion of men who own cats is larger than 50% at the .025 significance…

A: Given that  Claim :  The proportion of men who owns cats is larger than 50%  Hypothesized proportion…

Q: versity is trying to determine how many of their students have watched a bystander intervention…

A: Given: Total number of students = 3500 Number of students included in the survey = 1050 Percentage…

Q: What measure of central tendency is most appropriate to use if you want to know the passing score if…

A: Mean: It is an “arithmetic” mean. Mean is probably the most familiar average. The mean (of a set of…

Q: It is thought that 12% of all students taking a particular course received a grade of A. In a sample…

A:

Q: A software company is interested in improving customer satisfaction rate from the 66% currently…

A: From the provided information, A software company is interested in improving customer satisfaction…

Q: In a recent Gallup poll, 507 adults age 18 and older were surveyed and 269 said they believed they…

A:

Q: A marketing manager for a cell phone company claims that more than 35% of children aged 10-11 have…

A: Assume that p is the true proportion of all children aged 10-11 that have cell phones.

Q: A hypothesis test is conducted to determine whether the percentage of US adults that think marijuana…

A: Given,n=400x=144p^=xnp^=144400=0.36

Q: Calculate the test statistic,

A: Given that sample size is n = 76 And number of peoples who said they are confident of meeting their…

Q: 3. A Gallup poll conducted in 2010 found that 494 of 1050 adult Americans believe it is the…

A: Given that  Sample size n =1050 Favorable cases x =494 Sample proportion p^=x/n  =494/1050 =0.4705

Q: compared to the median, the mean number of hours that participants watch television is ___.  -lower…

A: The given Statistic is :

Q: What is the 40th percentile of wait times for customers calling the help line?

A: Here given  Amount of time customer wait is exponentially distributed with mean 7.5 minutes

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A:

Q: Are freshmen psychology majors more likely to change their major before they graduate compared to…

A: Given Information :   344 of the 618 freshmen psychology majors from a recent study changed their…

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

A:

Q: Find the standardized test statistic .

A: p1 = 0.45p2 = 0.39 n1 = 1042n2 = 1061

Q: The National Study of the Changing Workforce conducted an extensive survey of 2958 wage and salaried…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: The state Government gives grants to low-income undergraduate students. According to the National…

A: The given hypotheses are as follows: H0: µ = 2,600. Ha: µ ≠ 2,600. The sample size is 50 students,…

Q: Pick a sample problem where despite correlation, causation cannot be reasonable argument.

A: Let us take an example of sales of umbrella and sales of raincoats. Sale of raincoats Sale of…

Q: What is the 25th percentile of a χ2 distribution with 20 degrees of freedom? What symbol is used to…

A: It is an important part of statistics. It is widely used.

Q: (a) Among the next 210 customers, what are the mean and variance of the number who pay with a debit…

A: Consider the events A, B and C that represents the customers who pay with a credit card, debit card,…

Q: 2. For Americans using library services, the American Library Association claims that at most 70% of…

A: Given: The random sample of patrons selected are n=100. The number of patrons who borrowed books are…

Q: How does an observed sample mean qualify as a common outcome?

A:

Q: An article describes a study of the health effects of ozone air pollution on children’s health. Out…

A: It is given that out of 68 children who lived in areas with low ozone levels, 30 missed at least one…

Q: A company that sponsors LSAT prep courses would like to be able to claim that their courses improve…

A: There are two dependent samples which are initial test and post test. We have to find the test…

Q: Espaí A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in…

A:

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: Solution : Given : n1 = 32693  n2 = 1536 x1 = 225 x2 = 8 α  = 0.05 To test the evidence that…

Q: A car wash is assessing the average wait time for its customers. The median wait time is 4 minutes.…

A: When we talk about median , it is the middle number in a sorted, ascending or descending, list of…

Q: How does an observed sample mean qualify as a rare outcome?

A:

Q: For fast-food restaurants, the drive-through window is an important revenue source. The fast-food…

A: Given that For fast-food restaurants, the drive-through window is an important revenue source. The…

Q: If the mean time to respond to a stimulus is much higher than the median time to respond, what can…

A: There can be three different shape of the distribution: 1) Positively skewed: Most of the values…

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.