Suppose that BC financial aid alots a textbook stipend by claiming that the average textbook at BC bookstore costs $$ 76.13. You want to test this claim. The null hypothesis in words would be:   The proportion of all textbooks from the store that are less than 76.13 is equal to 50% The average of price of all textbooks from the store is greater than $$ 76.13. The average price of all textbooks from the store is $$ 76.13 The average price of textbooks in a sample is $$ 76.13 The average of price of all textbooks from the store is less than $$ 76.13. Based on a sample of 120 textbooks at the store, you find an average of 83.33 and a standard deviation of 10. The point estimate is:  (to 3 decimals) The 95 % confidence interval (use z*) is:  to  (to 3 decimals)

6.2 If 20% of x equals 7, what is x?

5 Imagine that a company sells portable walkie-talkie radios to construction crews. The batteries for these radios last for an average of 55 hours. The purchasing manager for this company receives a brochure in the mail that advertises a new brand of batteries. This new brand of batteries is cheaper than the brand that the company currently uses. However, the purchasing manager is concerned that the cheaper batteries may have a shorter average battery life than the current brand. (Note: The number of hours that batteries last is called their battery life.) The pricing manager installs 40 randomly selected batteries of the cheaper brand in the company's walkie-talkie radios. He finds that the mean battery life for the sample is 52 hours, with a standard deviation of 10 hours. He wants to perform a statistical test at the 1% level of significance to determine whether the cheaper batteries have a shorter average battery life span than the average life span of the brand of batteries the…

Please answer number 8. Make sure to show work; thx!!

1.) Below are prices per gallon of regular gasoline at various Shell and Mobil gas stations. Shell:   $3.34   $3.56   $3.90   $4.01   $4.12   $3.36   $3.59 Mobil: $23.24   $3.25   $3.99   $3.99   $4.33   $2.99   $3.23   $2.90   $3.56   $3.12   At a= 0.01, test the claim that these two gas chains have the same average gas prices. a.) Use a hypothesis test    b.) Use an appropriate confidence interval 1a.) H0: ______________________   H1: ___________________   t= ________________ P-value __________________ Conclusion: _________________________________ b.) t a/2 = ____________________    CI: ____________________________ Conclusion: ___________________________________________

9. After looking at this list, you are concerned that you may not be able to afford the food that you have chosen to provide enough protein for your diet. So you have decided to get the biggest bang for your buck by comparing the amount of protein for the price that you can buy the food for. The following 4 items were priced at Walmart on 1/2/2014. Also included is the serving per item and the protein for each serving for the product chosen. Make sure to show your work. Price per Protein (g) Food Item Bush Pinto Beans Jif Peanut Butter Bumblebee Canned Chicken Cherrios Cereal Price per item $0.84 $3.98 $2.38 $3.68 Servings per item 3.3 25 4 18 Protein (g) per serving 78 78 13g 3g of protein?

your car is more crowded than you think.  table 5.8 reports results from a 1969 personal transportation survey on "home-to-work" trips in metropolitan areas. The survey stated that the average car occupancy was 1.4 people. check that calculation.