Assume that the data has a normal distribution and the number of observation is greater than fifty.  Find the critical z value used to test a null hypothesis.  a = 0.09 for a right tailed test.

Q: For the majority of maths tests taken at a school, it is shown that the test score is approximaly…

A: The normal distribution is the most useful theoretical distribution for continuous variable.  For…

Q: Use z-scores to compare the preformance of a student on two midterms: the first, with a mean of 78…

A: Given Information: The performance of a student on two midterms: First: Mean = 78, standard…

Q: Assume that the scores of a college entry exam are normally distributed with a mean of 400 and a…

A: Given,mean(μ)=400standard deviation(σ)=60

Q: The process that produces Purple Bars is intended to produce candy bars with a mean weight of 55 gm.…

A: Mean = 55Standard deviation = 0.9n = 59x' = 54.82

Q: A statistician wants to test the mean weight of a sample of 100 apples, with the null hypothesis…

A: Introduction: In this answer, I have provided the formula for calculating the t-statistic in the…

Q: AMy and Sandy work in a restaurant , the interval of customer show poission distribution wtih rate…

A: GivenThe number of customers arrive per hour =4The time taken for 1 customer to arrive…

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A:

Q: Consider a value to be significantly low if its z score less than or equal to minus−2 or consider…

A: In the question the values are printed two times as 19.419.4. For convenience, the values are taken…

Q: A politician claims that the mean salary for managers in his state is more than the national mean,…

A: The claim is that the mean salary for managers in his state is more than the national mean…

Q: ant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind of…

A: Hypothesis testing is conducted for the parameters of the population, like population mean,…

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: The hypothesized mean is 45.

Q: In a sample of12randomly selected high school​ seniors, the mean score on a standardized test…

A: We have given thatSample size (n) = 12Sample mean (x̅) = 1193Standard deviations (s) = 168.9…

Q: A car company says that the mean gas mileage for its luxury sedan is at least 24 miles per gallon…

A: Null hypothesis: µ≥24. Alternative hypothesis: µ<24. This is a left tailed test. Here, the sample…

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: a) Suppose μ is the population mean shopping time spent by customers at the supermarket.

Q: The average exam score is 66 with a variance of 20.  Your exam has a Z score of 0.12. What is your…

A: The z score indicates how many standard deviations that a data points away from the mean. It can be…

Q: find the P-value corresponding to the hypothesis that the average SAT score is less than 680.   A.…

A: It is given that  Population mean = 680 Sample mean = 667.4 Population standard deviation = 38…

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: To test the significant of one population mean when sample size is sufficient large with known…

Q: Robert thinks he and his brother Jack play a certain level on a video game at different speeds. He…

A: Given information- We have given two samples of video game speed of Robert and his brother Jack. Let…

Q: A math teacher claims that she has developed a review course that increases the scores of students…

A: Given  alpha=0.10, n=400, Xbar=520, s=113

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A: Let,  μ1 :  the population mean benzene concentration for untreated water and  μ2: the population…

Q: A consumer group claims that the mean minimum time it takes for a sedan to travel a quarter mile is…

A: Solution

Q: A student takes a standardized exam. The grader reports the student's standardized score (z-score)…

A: What is the mean of a set  of Standardized Z- scores? 1] Z- score is a numerical value that…

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A:

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: Given information- Population mean, μ = 45 milligrams Sample size, n = 30 Sample mean, x-bar = 46.4…

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A:

Q: Height and weight are two measurements used to track a child's development. The World Health…

A:

Q: A data set includes data from student evaluations of courses. The summary statistics are n= 94, x=…

A:

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: Given : Sample size (n) = 30Sample mean (X) = 57.4Population standard deviation (σ) = 7.3α = 0.04

Q: Q is known to be normally distributed with a mean of 100 and standard deviation of 15.  A small…

A: given data normal distribution μ = 100σ= 15n = 49x¯ = 94

Q: Workers at a certain soda drink factory collected data on the volumes (in ounces) of a simple random…

A: Assume that σ is the population standard deviation of volume of soda cans.

Q: A company that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola…

A: Introduction: Denote μ as the true population mean caffeine content in 12-ounce bottles of cola. The…

Q: Marco runs a small dairy farm that also processes milk products on-site. One popular product…

A: a) Empirical rule: The probability of the observation lies within 1 standard deviation of the mean,…

Q: Let x be a random variable representing the SAT math score of student. We may assume that x has a…

A: Given Information: Population mean (u) = 650 Sample mean (x) = 645 Sample size (n) = 75 Population…

Q: Assume that the mean weight for American men in their twenties is 180 pounds with a standard…

A: The provided sample mean is Xˉ=175\bar X = 175 and the known population standard deviation is…

Q: A math teacher claims that she has developed a review course that increases the scores of students…

A:

Q: You are part of a trivia team and have tracked your team's performance since you started playing, so…

A: Answer: From the given data, population mean(μ) = 78 Sample size(n) = 18 sample mean (x) = 89…

Q: Consider a value to be significantly low if its z score less than or equal to  minus −2 or consider…

A: Consider a value to be significantly low if its z score less than or equal to minus −2 or consider a…

Q: The average person spends a mean amount of $10.20 on coffee per week. You are interested to test if…

A: Given that   x̄ = 12.41 ,  μ = 10.20 , s = 5.25 , n= 31

Q: Write True or False beside each statement. If the statement is False, correct the statement. (a). A…

A: We hav given the following statements  based on true or false.  Note: According to Bartleby expert…