Fitting a straight line to a set of data yields the prediction line Yi=2+4Xi. The values of X used to find the prediction line range from 2 to 28.   a. Should this model be used to predict the mean value of Y when X equals 3​? yes, no , not enough information ?   b. Should this model be used to predict the mean value of Y when X equals −3​? yes, no, not enough information

Consider the following competing hypotheses: (You may find it useful to reference the appropriate table: z table or ttable) Hypotheses: He: HD 3 5; HA: HD > 5 Sample results: d = 9.5, Sp 6.2, n = 13 The following results are obtained using matched samples from two normally distributed populations: a. Calculate the value of the test statistic, assuming that the sample difference is normally distributed. (Negative value should be indicated by a minus sign. Round final answer to 3 decimal places.) Test statistic 1.836 b. Find the p-value. O 0.01 Picture p-value < 0.025 O p-value < 0.01 O p-value Picture 0.10 O 0.05 Picture p-value < 0.10 O 0.025 Picture p-value < 0.05 c. Use the 5% significance level to make a conclusion. O Do not reject Ho since the p-value is more than a. Reject Ho since the p-value is more than a. O Do not reject Ho since the p-value is less than a. O Reject Ho since the p-value is less than a.

Joselyn hopes to receive a grade of B or better in her statistics class. Currently she has scored 75, 83, and 81 on her three in-class tests and also has a homework average of 88. Her professor calculates the class grade by finding the mean of five grades: three in-class tests, the homework average and the final exam. What is the minimum score Joselyn must earn on the final exam to have a class grade (mean) of 80? A. 67 B. 95 C. 70 D. 73

A recent Nielsen analysis found that the typical U.S. smartphone user is spending an average of 220 minutes per day using apps. We speculate that the average time spent using apps for Generation X smartphone users (aged 41-56 years) is less than the national average. The hypotheses are Ho: H = 220 minutes versus Ha: µ < 220 minutes. Summary results from R are provided. Summary Statistics Std. Dev (s) Mean Sample Size (n) 205 minutes 63.25 minutes 31

please help answer fully

Consider the following data set *; | -1|2|3 Yi | 3 |2|1 and the model y = a, + a1¤ Calculate the squared error (SE) for the choice a, = 8 and a1 = -1 Answer:

Show complete answers and the complete process on how to get those answers.

Choose the best statement to summarize the association shown between hat size and IQ in the scatterplot below. Hat Size O The scatterplot does not show a trend that would indicate an association between hat size and IQ scores. O As hat size increases, IQ scores tend to decrease. O As hat size increases, IQ scores tend to increase. Hat size causes IQ to increase.

I don't understand how to complete this. please show step by step

h.