1)The average amount of time spent watching tv in Mexico is 2.8 hours. five students were asked how many hours of tv do they watch and they said 3, 2.5, 4, 1, 4.5. Compare that sample to the national average. What can we conclude about these students? ( use a T-test) fail to reject the or reject the null?

2)In order to study the effect of global warming, the water temperature of 36 lakes in Oregon was measured. The average March temperature of these lakes was 67 with an SD of 2 degrees Fahrenheit. In 2003, the average water temperature of lakes was 65. Has there been an increase in water temp since 2003? (use z-test) fail to reject the or reject the null?

3)Maria thinks her oven is not working properly. The cookie mixes say that she should be baking them for 8 minutes. Her last 9 batches of cookies were done after 7,6,8,7,9,8,9,6 and 10 minutes. Does she need to adjust her cook time? (use t-test) reject or fail to reject the null?

 

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1 The average amount of time spent watching tv in Mexico is 28 hours five students were asked ... View the full answer