Given n= 35 and o = 13, the margin of error at 2% alpha level is + Blank 1
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.When creating a 99% CI based on data from one sample the size of n=31, which t value should be used?A researcher is looking at a new marketing campaign for a product. After 200 people watched the marketing campaign about 60 percent liked the product. Prior to the marketing campaign the product was liked by about 50 percent of people. What is the chi-square cutoff for an alpha of 0.05 for this research project?
- A market researcher wanted to evaluate the difference in credit charges for customers of Bracy’s. She randomly selected 100 customers and recorded their credit charges in December 2004 and January 2005. Is there evidence to show a difference in credit charges between the two months?Step 1: Step 2: α =Ho: H1:Step 3 Step 4 Step 5 Step 6 Difference: Dec. 2004 - Jan. 2005 Sample Diff: 280.74152 Std. Err: 99.50361 p-value: 0.0058State the t critical value that would be used for a 99% interval based on a sample size of 37.A survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27 had a history of intrapartum or postpartum infection. Can we conclude that the population proportion with a history of intrapartum or postpartum infection is significantly less than or equal to 0.25? Let alpha = 0.05.
- The number of points held by a sample of the NHL's highest scores for both the eastern conference and the western conference is shown below. At alpha = 0.05 , can it be concluded that there is difference in means based on these data? look at the picture for the data!The height ( in inches) of a plant x months after an experiment begins is given byFind the product of approximate numbers x, = 2.37 and x, = 20.3546 all of whose digits are valid. %3D Also find absolute and relative errors.
- Heights (cm) and weights (kg) are measured for 100 randomly selected adult males, and range from heights of 135 to 190 cm and weights of 38 to 150 kg. Let the predictor variable x be the first variable given. The 100 paired measurements yield x = 167.42 cm, y = 81.41 kg, r= 0.193, P-value = 0.054, and y = - 106 + 1.14x. Find %3D the best predicted value of y (weight) given an adult male who is 142 cm tall. Use a 0.01 significance level. The best predicted value of y for an adult male who is 142 cm tall is kg. (Round to two decimal places as needed.)A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 231 days. After a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (in days): 230,233, 235, 236, 233, 240, 240, 241, and 237. Using α = 0.025, has the shelf life of the cake mix increased? Multiple Choice Yes, because computed t is greater than the critical value. Yes, because computed t is less than the critical value. No, because computed t lies in the region of acceptance. No, because 236.11 is quite close to 231.In a Ni-Cd battery, a fully charged cell is composed of nickelic hydroxide. Nickel is an element that has multiple oxidation states. Assume the following proportions of the states: Nickel Charge Proportions Found 0 0.17 +2 0.33 +3 0.33 +4 0.5-0.33 Determine the variance of the nickel charge. Please enter the answer to 3 decimal places.