Question: The photography department of a fashion magazine needs to choose
The photography department of a fashion magazine needs to choose a camera. Of the two models the department is considering, one is made by Nikon and one by Minolta. The department contracts with an agency to determine if one of the two models gets a higher average performance rating by professional photographers, or whether the average performance ratings of these two cameras are not statistically different. The agency asks 60 different professional photographers to rate one of the cameras (30 photographers rate each model). The ratings are on a scale of 1 to 10. The average sample rating for Nikon is 8.5, and the sample standard deviation is 2.1. For the Minolta sample, the average sample rating is 7.8, and the standard deviation is 1.8. Is there a difference between the average population ratings of the two cameras? If so, which one is rated higher?
Relevant QuestionsMarcus Robert Real Estate Company wants to test whether the average sale price of residential properties in a certain size range in Bel Air, California, is approximately equal to the average sale price of residential ...Active Trader compared earnings on stock investments when companies made strong pre-earnings announcements versus cases where pre-earnings announcements were weak. Both sample sizes were 28. The average performance for the ...Ikarus, the Hungarian bus maker, lost its important Commonwealth of Independent States market and is reported on the verge of collapse. The company is now trying a new engine in its buses and has gathered the following ...Recent advances in cell phone screen quality have enabled the showing of movies and commercials on cell phone screens. But according to the New York Times, advertising is not as successful as movie viewing. Suppose the ...According to USA Today, 32% of the public think that credit cards are safer than debit cards, while 19% believe that debit cards are safer than credit cards. If these results are based on two independent random samples, one ...
Post your question