A survey conducted in a college intro stats class asked students about the number of credit hours they were taking that quarter. The number of credit hours for a random sample of 16 students is given in the table. | 10 10 12 14 15 15 15 15 15 15| 15| 15 |17 17 | 19 | 20 || 20 | 20 | 20 | 22

Q: According to a gallup survey of boys 77% of boys had played computer games in the past week compared…

A: Let p1 be the percentage of boys had played computer games  p2 be the percentage of girls had played…

Q: Advertisers contract with Internet service providers and search engines to place ads on websites.…

A: Given:  38% of advertisers have been a victim of click fraud. Sample size=n=420.

Q: Advertisers contract with Internet service providers and search engines to place ads on websites.…

A: Given data is appropriate for z-test for single proportion . because it is a large sample…

Q: A contributor for the local newspaper is writing an article for the weekly fitness section. To…

A:

Q: A recent survey of 537 California college students found that 481 had taken an online class in the…

A:

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: The table and the bar chart below summarize the age at diagnosis, in years, for a random sample of…

A: State the hypotheses.

Q: Construct a 90% confidence interval for the true difference between the mean amounts of time spent…

A:

Q: Advertisers contract with Internet service providers and search engines to place ads on websites.…

A: Refer Standard normal table/Z-table to find the probability of z=0.63 & z=-0.63.

Q: A sample mean has a z= -4.0 on the sampling distribution created from the population of psychology…

A:

Q: a. Out of a random sample of 74 birds, how.many would you expect to live longer than 9 years? b.…

A: Let X = number of years a bird lives.  Then, X ~ Exponential (0.125) Thus,  f(x) = 0.125e-0.125x .

Q: Opinions are split about a coffee​ company's pumpkin-flavored coffee​ (PFC). Yet every year over the…

A: t= 3.07 Degrees of freedom = n-2 =8-2 = 6

Q: Opinions are split about a coffee​ company's pumpkin-flavored coffee​ (PFC). Yet every year over the…

A: Excel Procedure: Enter PFC and Spending in Excel>Data>Data Analysis> ‘Regression’>Select…

Q: The differences are not statistically significant for which items?

A: Introduction: The study compares dating and married couples on nine items, by comparing the mean…

Q: The University of Colorado conducted a Halloween candy consumption study. The researchers measured…

A: The descriptive statistics is conducted using EXCEL. The software procedure is given below: Enter…

Q: In 2016, the New York Times reported that the average American spent 50 minutes per day on Facebook,…

A: From the given information, AverageFacebook=50 Average reading, exercising, or actually socializing…

Q: To estimate the benefits of an SAT prep course, a random sample of 10 students enrolled in the…

A: Given 98% CI for the mean  Difference is (137.04,248.96)

Q: Opinions are split about a coffee​ company's pumpkin-flavored coffee​ (PFC). Yet every year over the…

A: In this case PFC (x) is the independent variable and Spending (y) is the dependent variable.

Q: Suppose an automotive repair company wants to determine the current percentage of customers who keep…

A:

Q: About 7% of males are colorblind. Hoping to find many colorblind men for her study, a researcher…

A: It is given that p =0.07 and n = 433.

Q: A data set is described as consisting of n = 15 scores. Based on the notation being used, the data…

A: We have the following statement .

Q: Suppose that in a large class at a major university, the instructor announces that the average grade…

A: Given information- We have given the average grade on an exam = 72 Since we know that from the…

Q: Who Smokes More: Male Students or Female Students? Information on a sample of 362 college students…

A: Provided information is, a sample of 362 college students is collected. It is observed that 27 of…

Q: Suppose a clothing store wants to determine the current percentage of customers who are over the age…

A:

Q: In order to estimate attendance at a music festival, management counts the number of people entering…

A: it is follow A,P with first term a = 2250, d = 2250 , n = 20

Q: A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults,…

A:

Q: of 90% with a sample

A: Given : Sample size = n = 19 Significance level, α =1- 0.9 = 0.1

Q: In a batch of 15 students, 3 students failed in an examination. The marks of passed 12 students were…

A:

Q: A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sample of 651 adults,…

A: From the given information,   better same worse Total Republican 38 104 44…

Q: Of a batch of 20 students, 4 students failed while 7 students passed with distinction. The remaining…

A: N=20 Average of 4 students is 23 and average of 7 students is 76.

Q: At Sundae King, 6 of the last 10 sundaes sold had nuts. Considering this data, how many of the next…

A: We have to find correct answer

Q: Olivia, Nicholas, Chloe, and Ethan each took many samples from the same population of students. The…

A: Given: 4 samples are given  Olivia, Nicholas, ethan and chloe And the number of students in each…

Q: Construct a 99%99% confidence interval for the true difference between the mean amounts of time…

A:

Q: The data represent the number of ounces of water that 26 students drank before donating blood: 8, 8,…

A: data for 26 students is 8 8 8 16 16 16 32 32 32 32 32 32 64 64 64 64 64 64 64 80 80 80 80 88 88 88

Q: You hypothesize that 75% of physics students are guys. You take a random survey of 12 physics…

A: In order to determine, whether the percentage of guys is different from 75%, or proportion of guys…

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: In 2016, the New York Times reported that the average American spent 50 minutes per day on Facebook,…

A: Let x¯1 and x¯2 be the sample mena time spent on Facebook and Other activities respectively. x¯1=50…

Q: Most people believe that smoking is unhealthy. The table given is the result of a study of randomly…

A: we have to find expected frequency ( i.e. Observed count )   Formula :  Eij = Ri×CjN Where ,  Ri…

Q: Students in a statistics class were asked, “About how many minutes do you typically exercise in a…

A: Introduction :-  Here we have to create the 5 number summary and to check for the outliers.

Q: What is the value of D4 in the scores of the random 10 students from Science: 22, 21, 26, 28, 24,…

A: Solution-: Given data: 22, 21, 26, 28, 24, 20, 27, 26, 26, 29 We want to find D4=?

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: contributor for the local newspaper is writing an article for the weekly fitness section. To prepare…

A: Given Data : For Sample 1 x̄1 = 4.8 n1 = 57 σ1= 0.8 For Sample 2…

Q: rcher asked a random sample of students at the library on a Friday night, “How many hours a week do…

A: If the selected sample or data for analysis is selected in such a way that randomization is not…

Q: Opinions are split about a coffee​ company's pumpkin-flavored coffee​ (PFC). Yet every year over the…

A: Excel Procedure: Enter PFC and Spending in Excel>Data>Data Analysis> ‘Regression’>Select…

Q: Predict the average amount spent by a customer who purchases 4 PFC drinks per week.   The average…

A: Let x be the number of PFCs purchased per week, and y be the amount they spend per​ week. The…

Q: A researcher wants to know if taking statistics improves critical thinking skills. She randomly…

A: Given that, A researcher wants to know if taking statistics improves critical thinking skills. She…

Q: A group of 1st ten shoppers in town mall have the following body temperature in degree celsius:…

A:

Q: A contributor for the local newspaper is writing an article for the weekly fitness section. To…

A: Given information: For the first sample (people who exercise in the morning), Sample size, n1=56…

Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.