Discrete or continuous? The number of patients who reported that a new drug had relieved their pain.

What scale should we use for the regressors? Expalain the reason?

Pregnant women are screened for a birth defect called Down syndrome. Down syndrome babies are mentally and physically challenged. Some mothers choose to abort the fetus when they are certain that their baby will be born with the syndrome. The most common screening is maternal serum screening, a blood test that looks for markers in the blood to indicate whether the birth defect may occur. The false-positive and false-negative rates vary according to the age of the mother.  Mother’s Age    False-Positive Rate    False-Negative RateUnder 30    0.040    0.37630-34    0.082    0.29035-37    0.178    0.269Over 38    0.343    0.029 The probability that a baby has Down syndrome is primarily a function of the mother’s age. The probabilities are listed here. Age    Probability of Down Syndrome25    1/130030    1/90035    1/35040    1/10045    1/2549    1/12 For each of the age 25, 30, 35, 40, 45 and 49, determine the probability of Down syndrome if the maternity serum screening produces a…

The average amount of money spent for lunch per person in the college cafeteria is $6.28 and the standard deviation is $2.92. Suppose that 8 randomly selected lunch patrons are observed. Assume the distribution of money spent is normal, and round all answers to 4 decimal placeswhere possible. What is the distribution of XX? XX~ N(,) What is the distribution of ¯xx¯? ¯xx¯~ N(,) For a single randomly selected lunch patron, find the probability that this patron's lunch cost is between $4.74 and $5.38. For the group of 8 patrons, find the probability that the average lunch cost is between $4.74 and $5.38. For part d), is the assumption that the distribution is normal necessary? NoYes

Arthritis is a very commonly occurring affliction. It is a major cause of lost work time and often results in serious disability.  Of the many types of arthritis, the most common type is osteoarthritis.  This condition is frequently due to wear and tear in the joints and is more likely to be found in people over 50.  It is very painful in the weight-bearing joints, such as the knees and hips.  Cartilage wears away on the bone ends, causing pain and swelling.  Osteoarthritis may develop after an injury such as a bone fracture or a joint dislocation.  To reduce the amount of time osteoarthritis patients are absent from work, it is important for them to have effective pain relief.  An experiment was conducted to compare the effectiveness of three new analgesics: A1, A2, and A3.  A clinic evaluated a large group of patients and identified 45 patients with a moderate level of pain.  Fifteen of the 45 persons were then randomly assigned to one of the three analgesics.  The patients were then…

The well-known psychologist Dr. Elbod has established what he calls his Generalized Anxiety Scale (GAS). The GAS, which is a scale from 0 to 10, measures the "general anxiety" of an individual, with higher GAS scores corresponding to more anxiety. (Dr. Elbod's assessment of anxiety is based on a variety of measurements, both physiological and psychological.)We're interested in making predictions about individuals' sleep behavior based on their GAS scores. The bivariate data below give the GAS score (denoted by x) and the number of hours of sleep last night (denoted by y) for each of the fifteen adults in a study. The least-squares regression line for these data has equation Ŷ=8.48-0.28x This line, along with a scatter plot of the sample data, is shown below. (The 2nd picture contains the rest of the data as it would not fit in the first pic and it includes the question as well.)