5. The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 59,500 miles. Is Cros
#1.) Dr.Radman has been collecting data on a simplified intake form. One measure that was taken was the amount of time (in minutes) it took people to complete this form. The time to complete the simplified form was Mean=22 minutes and Standard Deviation= 3 minutes (assume there were enough forms completed to justify using popula
Question 1 (Basic Business Statistics Tenth Edition Q 7.53.) DiGiorno's frozen pizza has some of the most creative and likeable advertisements on television. USA Today's Ad Track claims that 20% of viewers like the ads "a lot"" (Theresa Howard, "DiGiorno Campaign Delivers Major Sales," www.usatoday.com, April 1, 2002). Su
When to use a t-test and when to use a z-test. How to choose between a t-test and a z-test, a one-sample test and a two-sample test, and a one-sided and a two-sided test. Lists the assumptions made about the sample and the population for each test.
I need to know the answer in Z test not student test (test statistic is t) which was highlighted in pink. See attached file for full problem description. I am planning my second trip to Sweden. Of course, I had read about the country and one article stated the average woman there is 69 inches tall with a standard deviation
4. James Johnson, manager of quality control at Creative Auto Corp., just received a report from the assembly plant. The latest shipment of 200 lug bolts used to attach the wheels showed a mean diameter of 18.01 mm and a median of 17.92 mm. Therefore, James can conclude that the distribution of the diameters of the lug bolts a.
6. A researcher is interested in studying the relationship between certain driving habits and type of vehicle. He hypothesizes that signaling behavior will be different for drivers of trucks and cars. The data from observations made while driving are given below. Calculate the two-variable Chi-square test. State the null hypothe
Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores (a) above .10, (b) below .10, (c) above .20, (d) below .20, (e) above 1.10, (f) below 1.10, (g) above -.10, (h) below -.10?
A recent study was designed to compare smoking habits of young women with those of young men. A random sample of 150 women revealed that 45 of them smoked. A random sample of 100 men indicated that 25 smoked. At the significance level does the evidence show that a higher proportion of women smoke?
It is known that 40% of retail outlets in a certain area stock your product. An intensive marketing campaign is carried out, after which a survey of 80 outlets shows 41 stocking the product. Does this indicate a change significant at the 1% level. I need to know what equation would be used and the detail of the answer to th
An advertiser claims 'eight out of every ten housewives can't tell Albatross margarine from butter!' A consumer's group sets out to test this claim, and finds that among the 75 of their members, 21 can distinguish between Albatross and butter. Would this cause you to doubt the advertiser's claim? How do you create the formu
A student scores 50 on a psychology exam and 83 on an economics exam. The psychology exam has a mean score of 60 and the standard deviation of 5. The economics exam has a mean score of 80 and a standard deviation of 10. Find the z-score for each test and decide which exam score is relatively better. What is the z-score for th
What are some business situations in which ANOVA would be more appropriate than a "t" test or a "z" test?
The result ofa mathematical placement exam at Macy college for two campus is as follow Campus Number Mean Standard Deviation 1 330 33 8 2 310 31
At the time he was hired as a server at the Family Restaurant, Bob was told, "You can average more than $20 a day in tips." Over the first 36 days he was employed at the restaurant, the mean daily amount of his tips was $24.85 with a standard deviation of $3.24. With a 1% (or .01) Level of Significance, can Bob conclude that he
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief, u1, is greater than or equal to the annual spending (per person) for non-prescription allergy relief medicine, u2. A health insurance company conducted an independent st
A rental agent claims that the mean monthly rent for apartments on the east side of town is less than $750. A random sample of 19 monthly rents for apartments on the east side has a mean of $748, with a standard deviation of $18. If we assume that the monthly rents for apartments on the east side are normally distributed, is the
3. The equation for determining necessary sample size (n) for confidence intervals about the mean is: n = [z · s / E]2 Remember that the z-score corresponds to the level of confidence (if confidence is higher, the z-score is higher). a. If we double our confidenc
I'm confused! Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores.u a. above .10 b. below .10 c. above .20 d. below .20 e. above 1.10 f. below 1.10 g. above -.10 h. below -.10
At the local burger Shop, the average wait for burgers and coke is 3.0 minutes with a σ of .7 minutes. Recently a random sample of 50 customers found that their average wait was 2.75 minutes. At the 0.05 α, using a 1 tail test determine if there is any statistical difference and can the proprietor state that his average wait
The discussion part of the assignment is to discuss how investors will assess the stability of a fictitious company? What are the key financial ratios that measure the stability of an organization? Define stability. I need help with the part that says, "calculate these ratios" Please see attached.
Your boss has determined that on Wednesday, 5 random employees on the line to have a chance to obtain a $25 bonus if they produce more XT34's than 84% of all other employees on the line. Therefore, randomly choose five workers from the sample and determine if they will get a bonus. hint u will need to use a z-score. employee#/
Scores on the Graduate Management Admission Test (GMAT) are normally distributed with a mean of 500 and a standard deviation of 80. a. Find the probability that a randomly selected test-taker will score at least 640 on the GMAT. b. Find the probability that a randomly selected test-taker will score between 420 and 640.
Suppose that, in a sample of 200, we observe 140 successes. Is this sufficient evidence at the 1% significance level to indicate the the population proportion of successes is greater than 65%
Question was asked previously and the calculations not detailed enough for me to determine how the answer was received. Please provide detailed explanation - I got a different answer and I KNOW mine is not right! Question: A manufacturing process produces units that average 10 inches in length with a standard deviation of 3
Hypothesis is it takes 25 minutes or less to serve a meal. The sample size was 20 people observed for 80 minutes. The average time it took for all people to be served was 24 minutes.
Please answer the following question: - Explain thoroughly, the concept of standard deviation. - How does range affect standard deviation? - What is a z-score, and how do z-scores relate to the mean of a set of data? - Generally speaking, how is the percentage of data which lies in between two z-scores calculated?
Hypothesis testing: Please help me with the sample problem 3 (one attachment page 5). If you have trouble with the attachments, you can download them here: http://www.sunflowerlabs.com/samples/c2fecd130005.jpg