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In a city in italy, 30% of the families have a mastercard 20% have AMEX, 25% Visa, 8% M/C & AMEX, 12% Visa/MC, 6% have AMEX & Visa ... 1. what is the probability of selecting a family that has either a visa card or an american card? 2. if a family has a M/C, what is the probability that it has a visa cardd? 3. If a family has a visa card, what is the probability Have to show work in excel.
Construct a 99% confidence interval for the average length of usage time to recharge.
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
Score for the states eith graders on the examination is more than 260. At alpha equals 0.04 is there enough evidence to support the clim?
The heights were measured for nine supermodels. They have a mean of 67.1 and a standard deviation of 2.3 in. Use the traditional method and a 0.01 significance level to test the claim that supermodels have heights with a mean that is greater than ..
Syracuse Roadbuilding Company is considering the purchase of a new tandem box dump truck. The truck costs $95,000, and an additional $5,000 is needed to paint it with the firm logo and install radio equipment.
What is the difference between statistical significance and practical significance? Can a hypothesis test result be statistically significant and yet practically useless.
A large population of metal rods have an average diameter of .943 inches with a standard deviation of .001 inches. The engineering specification for the rods requires that they be between .941 and .944 inches.
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
The impact of campaign film on attitudes toward a political candidate was investigated. Prior to showing the film, the attitudes of 15 people toward the candidate were assessed using a political likability scale.
Teens were asked in the MTF 2006 survey how often they think about social issues (specific issues were not identified). The bivariate table includes responses organized by teen's race.
A business invests $10,000.00 in a savings account for 2 years, At the beginning of the second year, an additional $3500.00 is invested, At the end of the second year, the account balance is $15,569.75. What is the annual interest rate?
A total of 61,647 people responded to an Elle/ MSNBC.com survey. It was reported that 50% of the respondents were women and 50% men.
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