A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99​% confident that his estimate is in error by no more than two percentage points? Complete parts​ (a) through​ (c) below.

Q: As the number of degrees of freedom for a t distribution increases, the difference between the t…

A: What happened if the deg. of freedom for a t-distribution increases?

Q: The mean time required to repair breakdowns of a certain copying machine is 93 minutes. The company…

A: Population mean = 93 Sample size= 18 Standard deviation = 16.6 Sample mean = 88.8

Q: Find z such that 6% of the standard normal curve lies to the left of z. ____  b. Find z such that 7%…

A: Solution-: We find z such that, (a)  6% of the standard normal curve lies to the left of z (b) 7% of…

Q: maximal margin of error associated with a 90% confidence interval for the true population mean…

A: You measure 45 watermelon's weights, and find they have mean weight of 68 ounces.  population…

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A: We have given the t-distribution with appropriate degrees of freedom. We have to find the critical…

Q: The accompanying data represent the total travel tax​ (in dollars) for a​ 3-day business trip in 8…

A: 67.72,80.44,69.28,84.12,80.04,87.14,101.22,98.62sample size(n)=8

Q: It currently takes users a mean of 44 minutes to insta made to the program, the company executives…

A: Sample size=51 Sample mean=47.8  Population mean=44 Standard deviation =10.2   Level of…

Q: Determine the t-value in each of the cases. Click the icon to view the table of areas under the…

A: We have given that,  Degree of freedom (df) = 20 and significance level = 0.10 ( right tail)

Q: A random sample of size n = 4 taken from a normal population with σ 2 = 9 is used to test H0 : µ =…

A: Sample size: n=4 Population variance: σ2=9 Null hypothesis: H0:μ=μ0 Alternative hypothesis: H1:μ=μ1…

Q: For a standard normal distribution, find: P(z > 1.2)

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: Suppose the heights of men are normally distributed with a mean of 68.4 inches and a standard…

A: Population mean μ=68.4, standard deviations σ=5

Q: A weight-loss clinic advertised that last month its patients, on average, lost 6 lb. Assuming that…

A: It is required to choose the correct statement(s).

Q: According to an​ airline, flights on a certain route are on time 85​% of the time. Suppose 10…

A: p=0.85, n=10

Q: Researchers conducted trials to investigate the effects of color on creativity. Subjects with a red…

A: Background μ n x¯ s Blue μ1 31 3.62 0.51 Red μ2 36 2.92 0.88

Q: . A 95% confidence interval for P1 - P2 given that P1 = 0.25 with n1 = 40 and P2 = 0.40 with n2 =…

A: Given 1) P1=0.25, P2=0.40, n1=40, n2=120 2)  x1 =45 in group 1 with size n1=71      x2 =56 in group…

Q: In a study on infants, one of the characteristics measured was head circumference. The mean head…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: els of cooperation among persons contacted in surveys and this brings concerns to pollsters. A…

A: Given data:   Agreed to respond Refused to respond Total 18-21 years 88 16 104 22-29 years…

Q: What is the sample size? What is the sample mean? Calculate the sample variance.  What is the…

A: What is the sample size n=50

Q: In an experiment, a coin is tossed until the head is observed for the second time. What is the…

A: It is given that a coin is tossed until the head is observed for the second time. Define sample…

Q: A binomial probability experiment is conducted with the given parameters. Compute the probability of…

A: Given that, The distribution is binomial with parameters, n = 11 p = 0.15 q = 1-p = 1-0.15 = 0.85…

Q: Suppose that X = {4,8,12,16} and that X 1 ={4,8} X 2 ={4,12} X 3 ={4,16} X 4 ={8,12} X 5 ={8,16} X…

A: Solution-: Given data:  xi:4,8,12,16 X1=4,8;X2=4,12;X3=4,16;X4=8,12;X5=8,16;X6=12,16 We want to find…

Q: The plot above shows the number of computers a store sold the first four days of this week. How…

A: From the given plot, Day Number of computers sold Mon 5 Tue 6 Wed 2 Thur 10

Q: Out of 890 families with 5 children each, How many you expect to have a) 3 boys

A: Answer: From the given data, Sample size(n) =5  The probability that a child is boy or a girl is…

Q: EXPONENTIAL REGRESSION: 1) With the following data apply the exponential regression (IMG 1) A.…

A: To apply exponential regression and answer the questions, follow these steps in R: Step 1: Create a…

Q: Because npo (1-Po) = 85.3 > 10, the sample size is less than 5% of the population size, and the…

A: It is given that  p = 58% = 0.58 Favourable cases, X = 207 Sample size, n = 350

Q: The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a…

A: For men:  Mean(µ) = 69.1 Standard deviations (σ) = 2.61 For Women:  Mean(µ) = 64.4Standard…

Q: You measure 41 textbooks' weights, and find they have a mean weight of 57 ounces. Assume the…

A: We have given that.Sample size (n) = 41 Sample mean (x̅) = 57Standard deviations (σ) = 8.5Confidence…

Q: Suppose that a random sample of 128 graduate-admissions personnel was asked what role scores on…

A: From the provided information, Sample size (n) = 128 From which 70 answered "very important". Sample…

Q: Researchers conducting a study of 15 children with a diagnosis of ADHD wish to assess whether the…

A: The BMI of 15 children is given.

Q: According to the U.S. Department of Transportation’s Air Travel Consumer Report, the nation’s 12…

A: The sample size is 28, sample mean is 14.2 and sample standard deviation is 6.4.

Q: It currently takes users a mean of 44 minutes to install the most popular computer program made by…

A: Hypothesized mean µ = 44 minutes Sample size (n) = 51 Mean x̅ = 47.8 minutes Standard deviation (s)…

Q: Consider the following list of Xi, Yį values: X₂ Y₂ 2 2 4 3 6 123 2 Using the above data, determine…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a…

A: Answer:- Given, mean, µ = 5.6  Standard deviation, σ = 2.2  Let, X = participant's response life.…

Q: LINEAR REGRESSION 3. The following are the heights and weights of the players of the Uniminuto…

A:

Q: A sample of size n taken from a normal population with a known variance of o² = 9.7969 is used to…

A: From the given information, σ2=9.7969.

Q: What is the equation for the line of fit? y=-³x+26 y = -x +32 y = -x +30 Based on this data, which…

A: Here  Take x = hours practiced per week y = missed free throw in percentage

Q: Consider a population having a standard deviation equal to 9.96. We wish to estimate the mean of…

A: Given,Standard deviation(σ)=9.96  Margin of error(E)=1

Q: Suppose that a random sample of 150 graduate-admissions personnel was asked what role scores on…

A: We have given that, Favorable cases (x) = 83 and sample size (n) = 150 Then,  We will find the 95%…

Q: A 138.

A: Probability is the method used to obtain the chance of an event happening. It never takes negative…

Q: A sample of 26 observations is taken from a normal Histribution with unknown mean. The sample mean…

A: The 95% confidence interval for the true population mean is obtained below as follows: The formula…

Q: 11.8 The more costly and time-consuming it is to export and import, the more difficult it is for…

A: a. To test for the difference in the mean cost of importing across the four global regions, we can…

Q: The income of males in each state of the United States, including the District of Columbia and…

A: We need to find the 99% confidence interval for the difference in incomes between males and females…

Q: A. In words, state what your random variable Xd represents. B. State the distribution used for the…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub- parts for…

Q: e shape of the distribution of the time required to get an oil change at a 10-minute oil-change…

A: The shape of the distribution of the time required to get an oil change at a 10-minute oil-change…

Q: A researcher is interested in examining whether self-affirming oneself leads to increases in…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: Giving a test to a group of students, the grades and gender are summarized below A B C 5 11 19 6 17…

A: Total=5+11+19+16+6+17=74 Male=5+11+19=35

Q: Find the variance and standard deviation for the following sample data 16, 28, 31, 49, 8

A: Answer: From the given data, 16, 28, 31, 49, 8

Q: The mean and the standard deviation of the sample of 100 bank customer waiting times are x = 5.09…

A: (1)   Obtain the 95% confidence interval for the population mean of all possible bank customer…

Q: The following three independent random samples are obtained from three no with equal variances. The…

A: Given information for Workshop study: The sample size is n1=15. The sample standard deviation is…

Q: Professor Jones took a random sample of 8 students and asked them how many times per week they dine…

A: Number of students n=8  x: 2 , 2 ,3 ,4 , 5 , 5 , 6 ,7