An automobile manufacturer claims that its van has a 28.8 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van since it is believed that the van has an incorrect manufacturer's MPG rating. After testing 300 vans, they found a mean MPG of 28.9. Assume the variance is known to be 2.25. A level of significance of 0.05 will be used. Make a decision to reject or fail to reject the null hypothesis.

Q: 12. The red blood cell count for a population of adult males can be approximated by a normal…

A: We have given that  X~N( μ , ?^2 )    μ = 5.4    , ? = 0.4   Z-score =( x - μ )/?  ,

Q: What percent of cans will have a caffeine content greater than 35 mg?

A: Let X be the random variable of the caffeine content of a cola.Given that,Population mean

Q: hat would you set your alpha-level at? Adrian examined the calcium intake in three groups of…

A:

Q: Suppose the National Transportation Safety Board (NTSB) wants to examine the safety of compact cars,…

A: Given information: Table representing given data:   Compact cars Midsize cars full-size cars…

Q: Advertising and Sales. Use the technology of your choice to do the following. a. Obtain the…

A: a. The data gives a company’s total sales (y), along with their expenditures on advertising in…

Q: Researchers examined the influence of a television program on children's aggressiveness. The number…

A: Solution

Q: respectively. Likewisethe range values for the each of 6 samples are 1,8,0.7,0.5,0.4,0.2, and 0.9…

A: An X-bar (X⎯⎯⎯X¯) chart is nothing but the quality control chart used to arrange subgroups mean and…

Q: Bottles for room spray are supposed to weigh exactly 16 oz. Inspectors want to develop process…

A: Given : n = 5

Q: What statistical test should he use to analyze the data? a. Independent Samples t-test b. Chi…

A: From the given data, we have to test whether female employees are more likely or less likely to be…

Q: Researchers examined the influence of a television program on children's aggressiveness. The number…

A: Note: As per my policy i can answer only three sub parts . kindly repost the remaining sub parts…

Q: The accompanying data set includes volumes (ounces) of a sample of cans of regular Coke. The summary…

A: Sample size, n=36 Sample mean, x¯=12.194 Sample standard deviation, s=0.117

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: The range and the variance are both measures of distance.

A: Solution-: The range and the variance are both measures of distance.

Q: Meteorologists in Texas want to increase the amount of rain delivered by thunderheads by seeding the…

A: Solution: n= 30 Sample size μ=300 Population mean

Q: Identify the null and alternative hypotheses. Hoμ H₁μ 12.00 # 12.00 (Type integers or decimals. Do…

A: Step 1:     Step 2:   Step 3: State the conclusion about the null hypothesis.Since the P-value is…

Q: Researchers examined the influence of a television program on children's aggressiveness. The number…

A: 1. We can carry out a two-tailed t-test to determine if there is a significant difference in the…

Q: The recidivism rate for convicted sex offenders is 15%. A warden suspects that this percent is…

A:

Q: tor for a medical assistance program wishes to test the hypothesis that her students score higher…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: A researcher wants to know if there is a difference in how busy someone is based on whether that…

A: To test if there is any difference in how busy someone is based on whether that person identifies as…

Q: Three years​ ago, the mean price of a​ single-family home was ​$243,741. A real estate broker…

A: We want to tell you, which one is the correct choice.

Q: A survey claims that 9 out of 10 doctors recommend brand W for their patients who have children. To…

A: Hypothesis Testing: It is basically a comparison of the statistical measures of the data with one…

Q: nd median for each of the two samples and then compare the two sets of results 114 124 139 104 129…

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

Q: patient. The mean difference is calculated Md= -4 with SS= 16.  a. Using symbols, state the…

A: )

Q: STEP 4: Calculating F value. Calculate the following Ex² = %3D SSB = SSW = Therefore, MSB = MSW %D…

A: Given that, the Land Transportation and Franchising Regulatory Board (LTFRB) wants to examine the…

Q: compare the breathing rate before and after breath holding. chose the correct statistical test what…

A: For comparing the breathing rate before and after breath holding , we will be measuring the…

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A:

Q: Answer the following questions using this dataset: X у 16.4 94 19.7 63 26.3 36 32.4 15 38.2 2 Round…

A: Given dataset is,XY16.49419.76326.33632.41538.22

Q: A researcher wants to evaluate the effectiveness of a patch he thinks will significantly decreases…

A:

Q: The regression equation is y=+x. (Round to one decimal place as needed.) Given that the systolic…

A: from given date first find mean; Mean of X =MX=∑Xn=4555=91 Mean of Y =MY=∑Xn=7775=155.4

Q: 2. A researcher claimed that the amount of time spent by boys and girls in social media each day is…

A:

Q: a consumer advocacy group claims that the mileage for the Carter Motor Company's new sedan is less…

A: Type II Error: The type II error occurs if “fail to reject the null hypothesis if the null…

Q: You are comparing two chemical processes that manufacture the same product in two different…

A:

Q: An auto-parts store offers a fuel additive that claims to increase a vehicle’s gas mileage. The…

A: Two methods of collecting data are given in the question. An experiment is basically a controlled…

Q: The accompanying data set includes volumes (ounces) of a sample of cans of regular Coke. The summary…

A:

Q: A pharmaceutical scientist is testing a drug if it has any effect on helping students improve their…

A:

Q: Rick took a test that is known to produce normally distributed grades with a mean of 72 and a SD of…

A:

Q: Once? b. X+1 times, where X is 5? c. X+4 times, where X is 5?

A: A patient is classified having gestational diabetesif their is average glucose level above 140…

Q: This is a friendly reminder about scientific notation. Excel reports very small numbers in…

A: This problem can be solved in two ways  using the given information.

Q: In the population of senior students at Shermer High School, the proportion who plan to attend…

A: From the provided information, Population proportion (p) = 0.64 Sample size (n) = 100 Sample…