2. Researchers wanted to study physical activity in children, so they gave 74 randomly chosen children a "FitBit" to record how many steps they took each day. Additionally, the scientists recorded each child's Body Mass Index (BMI) and grade in school. Grade was coded as middle or high school. The results of their analysis are below: Table 1 - Factors Contributing to Daily Steps Taken Intercept BMI Grade_middle Estimate 6,350.2 -137.5 1,302.4 SE 316.1 54.9 588.3 a. Calculate the test statistics for each predictor in the model and determine which are significant (you don't have to write full conclusion for each as long as you indicate which are significant). Given: critical value = 1.99 b. Interpret the estimate of Grade_middle in context.

Find the weighted estimate, p to test the claim that p, p2. Use a= 0.02. The sample statistics listed below are from independent samples. n, = 1000, x, = 250, and n, = 1200, x, = 195 3D195 一 O A. 0.789 O B. 0.202 OC. 0.138 O D. 0.110 uc OF

Find t0.69t0.69 for TT distribution with 8282 degrees of freedom. t0.69=t0.69= (Round the answer to 3 decimal places)

Given SST = 2415, SSE = 1725, n = 7, and k = 2, calculate the value of the overall F test statistic. O Feal = 3.50 O Fcal = 1.25 O Fcal = 0.40 O Fcal = 0.80

What are percentiles useful for  a. showing frequency b.comparing values  c. showing concentration

The amount of time a service technician needs to change the oil in a car is uniformly distributed between 11 and 21 minutes. Let X = the time needed to change the oil on a car. c. Find the 50th percentile. Round to the nearest minute.

An agent for a residential real estate company in a suburb located outside a major city has the business objective of developing more accurate estimates of the monthly rental cost for apartments. Toward the g the agent would like to use the size of an apartment, as defined by square footage to predict the monthly rental cost. The agent selects a sample of 8 one-bedroom apartments and the data are shown. Comple parts (a) through (f). a. Construct a scatter plot. Choose the correct graph below. O A. 2,000 ★Rent ($) → 2,000 Size (sq ft) Q O B. ★Rent ($) 2,000+ to Monthly Rent ($) Size (Square Feet) 0 S 1.₂ 2,000 Size (Sq ft) Q Q □ b. Use the least-squares method to determine the regression coefficients bo and b₁. 900 1,600 825 1,450 1,900 975 1,825 1,300 900 1,200 1,050 1,200 1,900 700 1,350 1,100 bo = (Round to one decimal place as needed.) b₁ = (Round to one decimal place as needed.) c. Interpret the meaning of bo and b₁ in this problem. Choose the correct answer below. (---) O C. 2,000…