The monthly earnings of a group of business students are normally distributed with a standard deviation of 545 dollars. A researcher wants to estimate the mean monthly earnings of all business students. Find the sample size needed to have a confidence level of 95% and a margin of error of 128 dollars. O a. 2 O b. 5 О с. 61 Od 70

Q: 348 homes in Oregon found that 156 were heated by natural gas. Test the claim that proportion of…

A:

Q: what is the p-value?

A: From the solution  Z=2.383 α=0.05 We have to perform a two-tailed test  So, From z table ( check…

Q: You land a job at an online marketing/consulting firm after attaining a business degree with an…

A: Given information: Browse Time(min.) Zero One Two 0 to 10 1000 900 100 11 to 20 1500 2600 500…

Q: C)Which model appears to be most suitable? Linear, quadratic, exponential using first differences,…

A: Note:  As per guidelines we will solve the first question only, please repost other questions for…

Q: Use this bar graph to answer the questions. Income (in Dollars) 40,000 32,000 24,000 16,000 8000 0…

A:

Q: Dentists believe that a diet low in sugary foods can reduce the number of cavities in children. Ten…

A: We have to find confidence interval for difference in means Since population standard deviations are…

Q: The following histogram shows the exam scores for a pre algebra class. Uses histogram to answer the…

A: Given: Class Frequency 1 15 2 16 3 14 4 11 5 4 6 18

Q: A researcher collected sample data for 19 middle-aged women. The sample had a mean serum cholesterol…

A: Sample size (n) = 19Sample mean (x̅) = 190.3 Standard deviations (s) = 9.5Significance level (α) =…

Q: OA. Do not reject Ho. There is insufficient evidence that the two means are different OB. Do not…

A: Given: x¯1=8s1=4n1=25x¯2=13s2=9n2=25Confidence level = 0.99 α=0.010

Q: Intercept *₂ A study of 30 secretaries' yearly salaries (in thousands of dollars) was done. The…

A: a) The regression equation is: y=9.191+0.114x1+0.072x2+0.097x3+0.013x4+0.064x5

Q: 3) Suppose that X₁, X₂, ..., X₁00 is a random sample from a normally distributed population with…

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

Q: at teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that,…

A: According to the given information in this question We need to identify the correct conclusion

Q: The Army reports that the distribution of head circumferences among male soldiers is approximately…

A:

Q: Suppose a statistics instructor believes that there is no significant difference between the mean…

A: Complete solution and answer is given in the image uploaded below  Thanks!

Q: The table shows the total square footage (in billions) of retailing space at shopping centers and…

A:

Q: Fish story: According to a report by the U.S. Fish and Wildlife Service, the mean length of…

A: GivenMean(μ)=480standard deviation(σ)=42

Q: 3. The following data are the heights in centimeters of 200 female students in a certain college.…

A: Given information: Length Frequency 150 < X < 155 21 155 < X < 160 44 160 <…

Q: Matrimony Monthly is a magazine that provides information for couples thinking about marriage. Over…

A: The question is about chi square test Given : Prop. of weddings take place in a church ( pchurch ) =…

Q: through (c) below. Students Given Four Quarters Students Given a $1 Bill either four quarters or…

A:

Q: Preliminary analyses indicate that you can consider the assumptions for using nonpooled t-procedures…

A: Here we use the t test for two means because the population standard error is not given and the…

Q: Archeologists have studied sizes of Egyptian skulls in an attempt to determine whether breeding…

A: Given data is128.1,138.4,126.2,131.9,142.8,135.3,139.2,129.1  sample size(n)=8confidence level=99%

Q: nsider the following frequency table representing the distributic morning walk with the dog (in…

A: Formula for midpoint of class frequency distribution table.  Midpoint = (upper class + lower…

Q: A variable x is normally distributed with mean 20 and standard deviation 8. Round your answers to…

A: GivenMean(μ)=20standard deviation(σ)=8

Q: A linear regression analysis is used to analyze the relationship of the sleep time the night before…

A: Given info: A linear regression analysis is used to analyze the relationship of the sleep time the…

Q: The proportion p of residents in a community who recycle has traditionally been 60%. A policy maker…

A: As per our guidelines we are suppose to answer one question1)Given claim is that the proportion (p)…

Q: Suppose the above bell curve (normal distribution) represents the voters and their viewpoints (the…

A: The bell curve represents the voters and their viewpoints such that the height of the curve…

Q: Find the mean, variance, and standard deviation of the binomial distribution with the given values…

A: Given that  Number of trials n=124 Success of probability p=0.52 ,q=1-p=0.48 X~binomial(n,p)

Q: ← Question 14 of 20 > A sociologist randomly selects single adults for different groups of three,…

A: Solution is given below

Q: A statistics professor plans classes so carefully that the lengths of her classes are uniformly…

A: Solution:X follows Uniform(a = 47.0, b=57.0)Pdf of Uniform distribution isf(x) = 1/(b - a) when…

Q: ermine the variables for the studies below. Assuming that the underlying assumptions of the tests…

A: Here a consumer psychologist studied the relationship between gender and preference for Toyota,…

Q: Use this bar graph to answer the questions. Income (in Dollars) 40,000 32,000 24,000 16,000 8000 0…

A:

Q: REGION L 2 3 1 = SALES (Y) ('000 gallons) 160 220 140 190 130 ADVERTISING EXPENSES (A) ($'000) 150…

A: i.   Dependent variable: SALES (Y) (‘000 gallons) Independent variables: ADVERTISING EXPENSES (A)…

Q: According to a recent article about individuals who have credit cards, the mean number of cards per…

A: Given: The mean number of cards per person with credit cards is 4. Sample size n=60 Significance…

Q: Out of 400 people sampled, 260 preferred Candidate A. Based on this estimate, what proportion (as a…

A: Given info: Out of 400 people sampled, 260 preferred Candidate A. Based on this estimate, the…

Q: A point is generated at random in the plane according to the following polar scheme. A radius R is…

A: The Given point is generated at random in the plane. A radius R is chosen, the distribution of R2 is…

Q: Given a standardized normal distribution (with a mean of and a standard deviation of 1), complete…

A:

Q: Find the indicated critical value. 20.01 Click to view page 1 of the table. Click to view page 2 of…

A: We need to compute the z-critical value. The level of significance is α=0.01.

Q: 6.43 Inverse Normal, Standard In a standard Normal distribution, if the area to the left of a…

A: Given P(Z<0.43)=0.6666

Q: Big babies: The National Health Statistics Reports described a study in which a sample of 330…

A: We have given thatSample size (n) = 330Sample mean (x̅) = 25.4Standard deviations (s) =…

Q: Use the TI-84 Plus calculator to find the z-score for which the area to its left is 0.85. Round the…

A:

Q: Given below is the y-intercept and slope, respectively, of a line. -6 and 0 a. Determine whether the…

A: Given: Y-Intercept,b0= -6 Slope,b1=0

Q: Review Chapters 7 & 8 4) Using a 95% level of confidence, test the claim that the majority of…

A: n = 25 μ = 3 Confidence level = 95% Significance level α = 0.05 Formula Used: Test-statistic t =…

Q: Solve the system by 5x+2y = 1 25x+10y = 5 Select the correct choice below and, if necessary, fill in…

A:

Q: ly question I need answered is 6.9 but I added 6.7 since it’s needed for

A: Given: P (U) = 0.60 P(D) = 0.40 Let r denote red and b denote blue.

Q: Suzanne Zeedyk, a developmental psychologist at Dundee University's School of Psychology, conducted…

A: Given information: Group Sample mean Sum of squares     Away-facing 98.1 2064.59…

Q: A factorial experiment was designed to test for any significant differences in the time needed to…

A:

Q: Two movie theaters compete for the business of 1,000 customers. Assume that each customer chooses…

A:

Q: Question In a sheep breeding farm, an estimated 40% of the sheep suffer from a certain disease. A…

A: Given: P(M) = 0.4 P(T^|M^)  = 0.9 P(T|M) = 0.8

Q: (a)Consider a t distribution with 8 degrees of freedom. Compute P≥t1.16 . Round your answer to at…

A:

Q: Test the null hypothesis that the mean daily return is 2% against the alternative that the mean…

A: