Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous six months, in a sample of 115 new car buyers, 46 have traded in their old car. To determine (at the 10% level of significance) whether the proportion of new car buyers that trade in their old car has this is sickly significantly decreased, what is the test statistic? (please round your answer to two decimal places)

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

A: For country C n=1024,p hat =0.45 For country D n =1078 ,p hat = 0.41

Q: A College Alcohol Study believes that there is a difference in the percentage of women and men that…

A: Given that, n1=1000,n2=1000 The type of test is two tailed test The value of test statistic is, z =…

Q: Using a random sample of 3800 TV households, a media research company found that 50.3% watched the…

A:

Q: Suppose a researcher wants to estimate the population proportion of defective light bulbs. He took a…

A:

Q: Many athletes (and their parents) worry about the risk of concussions when playing sports. A…

A: First let us sort the head circumferences (in inches) for the players on the team; No. Head…

Q: quality conscious disc manufacturer wishes to know the fraction of disks his company makes which are…

A: Given Sample size =865 X=112

Q: Compute the test statistic. Round to two decimal places.

A: Sample size, n=2027 No. of adults who drank diet soda, x=485

Q: Spending on concessions at the movies varies by age of the movie goer. A random sample of 100 adults…

A: It is given that the random sample of 100 adults, 70 purchased popcorn in their 40’s. Another sample…

Q: The British Department of Transportation studied to see if people avoid driving on Friday the 13th.…

A: The μd is considered as the mean difference in traffic count between the Friday the 6th and 13th.

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

A:

Q: The state education commission wants to estimate the fraction of tenth grade students that have…

A: The sample size is The number of students reading above the eighth-grade level is . The objective is…

Q: s known that o = 2.15 pounds. %3D sample should be taken to be 93% confident that the sample mean is…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: dentify the claim and state Ho and H. The claim is "the proportion of adults in Country C who favor…

A: Given that  Sample sizes for Country C and D n1=1024 , n2= 1078 Level of significance =alpha = 0.09

Q: june, an investor purchased 250 shares of orcales(an information technology company) stock at $23…

A: We have given that data  weight w1=250 , w2=360 and w3=510 Weight average x1=23, x2=23 and x3=29

Q: In 1995, it was determined that 78% of US citizens supported a ban on household aerosols. Thinking…

A: To find: 1.Test statistics 2.p-value

Q: A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which…

A:

Q: If in a village actually involved by anthrax, 70 per cent of the goats are attacked and pei cent…

A:

Q: At the Fredericton High School it is estimated that at most 25% of the students ride bikes to…

A: Let, p = proportion of students who ride bikes to school

Q: According to the US Census Bureau in 2021, 23% of children under 18 live with only one parent.…

A: To test whether the percentage of children under 18 living with only one parent in Beacon Hills,…

Q: ou conduct a cross-sectional study of  800 patients to test a new screening tool for diabetes. In…

A: Given information: The number of patients who had false negative and false positive screens is 42,…

Q: Have you ever noticed, when watching a National Hockey League (NHL) game, that the players spend a…

A:

Q: The workers at drug factory took a random sample of 800 drug tablets and found that 40 of them were…

A:

Q: location on the two different dates is in the table. Estimate the mean difference in traf een the…

A: Given Sample size =10 Sample standard deviation=1538.35

Q: Consider the five-number summary of hourly wages ($) for a sample of sales managers. Min: 20.94…

A: five number summary : Min: 20.94 Q1: 37.64 Median: 77 Q3: 49.34 Max: 67.11   IQR = ?

Q: d. Give a 95% interval estimate of the number of fatal accidents per 1000 licenses in a city where…

A: Solution:  Given information: n= 42  Sample size  MSE= 0.3473  Mean square  error  The degree of…

Q: In a study about children's pocket money, two samples of schoolchildren were asked how much money…

A: Combined mean=n1x1+n2x2n1+n2 Given that, n1=first sample size of childrens pocket money=87 x1=first…

Q: A survey of 1195 CEOS finds that 717 believe the economy will improve next year. We are trying to…

A: We have given that,  Population proportion (p)= 66% = 0.66 and favorable cases (X) = 717 , sample…

Q: Find the standardized test statistic. z= (Round to two decimal places as needed.

A:

Q: A software company is interested in improving customer satisfaction rate from the 74% currently…

A:

Q: In 1995, it was determined that 78% of US citizens supported a ban on household aerosols.  Thinking…

A:

Q: Please help answering this one:

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: John works as a weld inspector in a shipyard. Because he keeps track of good and poor welds, he…

A:

Q: A survey of 120 fatal accidents showed that in 24 cases the driver at fault was inadequately…

A: Point estimate:   The population parameter which is estimated by using sample statistic is termed as…

Q: In 2016 the Better Business Bureau settled 84% of complaints they received in the United States.…

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

Q: A software company is interested in improving customer satisfaction rate from the 51% currently…

A: Solution-: Given: X=89,n=157,P0=51%=0.51  We want to find Z=?

Q: Suppose that insurance companies did a survey. They randomly surveyed 400 drivers and found that 310…

A: Given: Sample size (n) =400 Number of  drivers claimed (x) = 310

Q: A sample of 900 computer chips revealed that 68% of the chips fell in the first 1000 hours of their…

A: Solution is given below