According to a report from a business intelligence company, smartphone owners are using an average of 24 apps per month. Assume that number of apps used per month by smartphone owners is normally distributed and that the standard deviation is 4. Complete parts (a) through (d) below. CRITE a. If you select a random sample of 25 smartphone owners, what is the probability that the sample mean is between 23.5 and 24.5? 0.471 (Round to three decimal places as needed.) b. If you select a random sample of 25 smartphone owners, what is the probability that the sample mean is between 23 and 24? (Round to three decimal places as needed.)

Q: Weights of 9 students (in lbs) before and after a month-long training schedule are given below. Test…

A: Let  be the difference in mean weight between after training and before training.Given that,No. of…

Q: Consider the following set of dependent and independent variables. Use this data 10 12 15 17 19 23…

A: yx1x21001812312153141710101963231392517831186

Q: A type 1 error involves concluding that there is an effect when its just by chance alone, the null…

A: It is given that the statement about to the type 1 error. Here, need to find out the given statement…

Q: If A and B are independent events with P(A) = 0.25 and P(B) = 0.40, then PLA | B)-. a. 0.25 Ob. 0.10…

A: It is given that P(A) = 0.25P(B) 0.40

Q: Has that rate of genetic testing changed in recent years in the U.S.? In a 2016 Harvard Poll of…

A: This is a hypothesis test of one sample proportion Z test.Steps of the hypothesis  test as follows…

Q: ← There are 39 chocolates in a box, all identically shaped. There 14 are filled with nuts, 16 with…

A: There are 39 chocolates in a box, all identically shaped. There 14 are filled with nuts, 16 with…

Q: Do you carpool? Let X represent the number of occupants in a randomly chosen car on a certain…

A: Let X denote the number of occupants in a randomly chosen car.The probability distribution of X is…

Q: Construct a  99%  confidence interval for the mean number of letter sounds identified in one minute.…

A: It is given that Sample mean = 34.13Sample std. deviation = 23.95Sample size = 145Confidence level =…

Q: 11 of the 744 digital video recorders​ (DVRs) in an inventory are known to be defective. What is the…

A: From the provided information,11 of the 744 digital video recorders​ (DVRs) in an inventory are…

Q: The partially completed analysis of variance table given below is taken from the article, "Power and…

A: We have given the following ANOVA tableSource of Variation SSdfMSFPower 0.24001Knowledge…

Q: Source Factor B Factor A Interaction Error Total A = Sum of Squares 7.5 2) (use 2 decimal places) C…

A: It is needed to find the complete ANOVA table.

Q: Determine whether the study depicts an observational study or an experiment. Twenty patients with…

A: In this case, the considered number of sampled patients is specified to have been divided into two…

Q: Is there a significant difference between the pretest and posttest scores of the Grade 12 learners…

A: First we enter the given data in Excel.Then we can use the following method,Enter Data > Go to…

Q: 2. The continuous random variables X and Y have known joint probability density function 4x 0≤ y…

A:

Q: In a baseball​ league, there are three ​divisions, each consisting of five teams. A sportswriter…

A: Total number of divisions = 3The number of teams in each division = 5The task is to determine the…

Q: how did you find the answer to a? what were the steps?

A: The mean of the distribution,  million visitors per dayThe standard deviation of the distribution,…

Q: Determine the sample size required to estimate a population mean to within 19 units given that the…

A: It is needed to find the sample size based on the given confidence level, margin of error and…

Q: A common characterization of obese individuals is that their body mass index is at least 30 [BMI =…

A: It is required to determine whether there is compelling evidence to conclude that more than 20% of…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: From the provided information,

Q: The distribution of actual weights of wedges of cheddar cheese produced at a dairy is normal with a…

A: Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: analyze This figure plots the changes in Vietnam’s TB during the period January 2010 – December 2019

A: We have given a plot of the changes in Vietnam’s TB during the period January 2010 – December 2019.

Q: The mean percent of childhood asthma prevalence in 43 cities is 2.13%. A random sample of 30 of…

A:

Q: A distribution of values is normal with a mean of 90 and a standard deviation of 3. Find the…

A:

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: Unusual value: The Z-value is said to be Unusual if the Z is greater than 2 or less than –2. From…

Q: Exhibit 4-1 Given the following informations on customer' s preference Product A a. 0.064 b. 52 B c.…

A: Product Number of customer surveyed Customer favouring this product A800560B900612

Q: Suppose that we wish to seat 12 people, 6 men and 6 women, in a row of 12 chairs. In how many ways…

A: We have given thatSeat of 12 people Number of men = 6Number of women = 6

Q: The amount of water in a bottle is approximately normally distributed with a mean of 2.30 liters…

A: The amount of water in a bottle is approximately normally distributed with a mean of 2.30 liters…

Q: Future scientists: Education professionals refer to science, technology, engineering, and…

A: The question is about approximation.Given :Proportion of freshmen planning to major in STEM…

Q: The lengths of pregnancies are normally distributed with a mean of 269 days and a standard deviation…

A: From the provided information,

Q: A basketball coach believes that the variance of the heights of adult male basketball players is…

A: The sample variance and sample size of heights for basketball players are: & The sample variance…

Q: . Scores on an exam are normally distributed with a mean of 155 and a standard deviation of 15; find…

A: The mean is 155 and the standard deviation is 15.

Q: Starting salaries of 110 college graduates who have taken a statistics course have a mean of $44,966…

A: sample size(n)=110Mean()=44966standard deviation(s)=10302confidence level=99%

Q: stress. Among 206 vinyl gloves, 62% leaked viruses. Among 206 latex gloves, 13% leaked viruses.…

A: Sample sizes n1=206 ,n2=206Sample proportion are p1^=0.13

Q: The formula used to compute a large-sample confidence interval for p is p̂ ± (z critical value)…

A: The confidence level is 0.82

Q: Six items in the list below can affect the statistical power of an experiment. Select as many of the…

A: Statistical power in the context of an experiment refers to the probability that the study will…

Q: Tonys Restaurant is a company that manufactures two types of cooking pans. The forecasted amount of…

A: Pan 1Pan 2Forecast of demand 5537038000Processing time 0.10.08Average lot size100100Setup time21.5

Q: (a) Construct a  95%  confidence interval for the mean surgery time for this procedure. Round your…

A: n=127,x¯=137.7,s=23.1C.I = 95% = 0.95df = n - 1 = 127 - 1 = 126

Q: An author showed that the number of soldiers in a country's cavalry killed due to a certain type of…

A: The frequency distribution of the number of deaths is given as follows:Number of…

Q: According to a government agency, 18.8% of the population of a certain country smoked in 2016. In…

A:

Q: Factories A, B and C produce computers. Factory A produces 4 times as many computers as factory C,…

A:

Q: According to a report done by S & J Power, the mean lifetime of the light bulbs it manufactures is…

A: n=27,x¯=48,σ=4,μ=47Note: According to bartelby question answer guidelines an expert can solve only…

Q: The below data on the production volume x and total cost y (in dollars) for a particular…

A: here X denotes production volume  and Y denotes total cost.We also have given a regression equation…

Q: Future scientists: Education professionals refer to science, technology, engineering, and…

A: The given proportion of freshmen, who plan to major in a STEM discipline is p0=26% (or 0.26).For…

Q: The owner of a coffee shop has found that the amount spent by customers at the shop is normally…

A: The owner of a coffee shop has found that the amount spent by customers at the shop is normally…

Q: Which description best describes the value of r = 0.86? O a moderate, negative linear relationship O…

A: r = 0.86

Q: In regression analysis, the variable that is being predicted is:

A: Regression analysis is used when we want to predict value of dependent variable using given sample…

Q: Advertising Year Expenditure Membership Year $ (000) Subscriptions 2013 51 62 2014 58 68…

A: yearExpenditureSubscription2013516220145868201562662016656620176867201876722019777320207872202178782…

Q: The table below contains the average price paid for a new home in a certain area from 2000 to 2010.…

A: Given the data on the average price paid for a new home in a certain area from 2000 to 2010.Want to…

Q: A factory manager collected data on the number of equipment breakdowns per day. From those​ data,…

A: w012P(W=w)0.650.200.015

Q: of 14 women with a mean height less than 66.2 ​inches?   enter your response here ​(Round to four…

A: It is given that Mean, μ = 64.1Std. deviation, σ = 2.6