Q2. Direct Mailing Company sells computers and computer parts by mail. The company claims that at least 90% of all orders are mailed within 48 hours after they are received. The quality control department at the company often takes samples to check if this claim is valid. A recently taken sample of 160 orders showed that 140 of them were mailed within 48 hours. (a) Mention required conditions of the large sample for testing proportion and check these for the above problem. (b) Test at 1% level of significance the hypothesis that the percentage of all orders are mailed within 48 hours is less than 90%.

Q: In elementary statistics, how do you calculate class width? I don't understand it.

A: According to the given information in this question We need to find that how we calculate class…

Q: For a population With a mean of 75 and a standard deviation of 12, what is the probability that a…

A:

Q: When two births are randomly selected, the sample space for genders is BB, BG, GB, and GG. Assume…

A: It is given that the sample space is {bb, bg, gb, gg}.

Q: Data Set 1: 30, 58, 63, -12, 32, 35, 85, -18, -13, 41, 77, -5, -6, -39, 94, -32, 25, 42, 54, 38, 81,…

A: The datasets are given as: DataSet1=c( 30, 58, 63, -12, 32, 35, 85, -18, -13, 41, 77, -5, -6, -39,…

Q: there are 347 people that take a survey and assume that 112 of them are women. what percentage of…

A: The percentage of females in the survey is calculated below:

Q: The table summarizes results from 985 pedestrian deaths that were caused by automobile accidents.

A: Solution: The given table of data is

Q: The average number of cavities that thirty-year-old Americans have had in their lifetimes is 8. Do…

A: As per guidelines expert have to answer first question three subparts only dear student please…

Q: A data set contains the observations 3,5,7,3,5,6,. find ∑x

A:

Q: Assume that a recent survey suggests that about 79​% of adults have heard of the brand.   n=

A: It is given that a recent survey suggests that about 79​% of adults have heard of the brand.

Q: A Sample of 25 cities have been classified as high or low on their homicide rates and on the number…

A: The formula for chi-square is, χ2=∑fo-fe2fe In the formula fo is the observed frequency, fe is the…

Q: Explain why we use this formula E=row total * column total/sample size

A: Given that::: E=row total * column total/sample size

Q: Define the term rank.

A: Given the term rank of matrix.

Q: 10, 1, 13, 9, 5, 9, 2, 10, 3, 8, 6, 17, 2, 10, 15 a) Find the mean b) Find the median

A:

Q: What if the mean is 61?

A: Let X be the final exam score in statistics.Here X is normally distributed with a mean of 61 and a…

Q: Find the mean and variance of Set S (-8, 4, 0, 10, 16, 20)

A:

Q: The data collected from the 12 female & the calculations asking in the project are shown in the…

A:

Q: Mean=5 Mode=1 9,3,1,6, _,_, What are the two missing numbers

A: Step 1: Define the mean and the modeThe mean is the sum of all the values divided by the number of…

Q: Explain the concept of coefficient of Determination?

A: Coefficient of determination: The coefficient of determination is defined as the proportion of…

Q: Explain how descriptive and inferential statistics is different and what they consist of. Provide an…

A: Statistic It is a quantity obtained from sample

Q: Describe about THREE F TESTS.

A: The F tests  involves three basic steps, namely 1) F test of the equality of two variances. 2)…

Q: the numbers of touchdown passes that peyton manning threw in each of his 13 seasons with the…

A: Solution

Q: 3. A psychology professor wants to know if stress in his statistics class is in anyway affected by a…

A: Given Following notations can be assumed:   Psychology=A Other=B Male=1 17,-1,9,17,10,13,13,14…