An instructor wants to know whether using an interactive mat…

An instructor wants to know whether using an interactive math app improves students’ problem-solving skills. A group of 12 high school students takes a standardized math test before using the app. After six weeks of daily app-based practice, the same students take a posttest with similar questions. The instructor compares pretest and posttest scores to determine if the app increased performance. Which type of test should be used for this scenario?

Diabetes Mellitus Type 2 (Study Outline) For study only—this…

Diabetes Mellitus Type 2 (Study Outline) For study only—this is not medical advice or a substitute for professional care. 1. Background Definition: Chronic hyperglycemia resulting from insulin resistance and progressive β-cell dysfunction. Pathophysiology: Peripheral tissues (muscle, liver, adipose) become resistant to insulin’s effects. Pancreatic β-cells initially increase insulin output but eventually fail. Associated metabolic disturbances: ↑ hepatic glucose production, ↓ peripheral glucose uptake. Epidemiology: 90% of diabetes cases. Typically develops after age 40, but increasing prevalence in adolescents with obesity. Strongly linked to obesity, sedentary lifestyle, and family history. Risk Factors: Obesity (especially central/visceral). Family history, hypertension, dyslipidemia, polycystic ovary syndrome. Certain ethnicities: African American, Hispanic, Native American, Pacific Islander. 2. History Gradual Onset Symptoms: Polyuria, polydipsia, polyphagia. Fatigue, blurred vision. Recurrent infections (e.g., skin, vaginal, urinary). Poor wound healing, acanthosis nigricans. Often Asymptomatic: May be discovered incidentally on labs. Associated Conditions: Metabolic syndrome (obesity, hypertension, dyslipidemia, insulin resistance). DKA Rare: Hyperosmolar hyperglycemic state (HHS) more common. 3. Exam Findings General: Overweight or obese body habitus. Blood pressure often elevated. Skin: Acanthosis nigricans: hyperpigmented, velvety plaques (neck, axilla). Skin tags (acrochordons). Complications: Peripheral neuropathy (sensory loss, paresthesias). Retinopathy signs on fundoscopic exam (microaneurysms, exudates). Decreased vibratory sense or absent reflexes in feet. 4. Making the Diagnosis Diagnostic Criteria (any of the following): Fasting plasma glucose ≥126 mg/dL (×2). A1C ≥6.5%. 2-hour OGTT glucose ≥200 mg/dL after 75 g glucose load. Random glucose ≥200 mg/dL with classic symptoms. Laboratory Findings: Elevated or normal C-peptide (reflects continued endogenous insulin production). No pancreatic autoantibodies (distinguishes from Type 1 DM). Screening Recommendations: Adults ≥35 years, or earlier if overweight with additional risk factors. Repeat every 3 years if normal. Gold Standard: Biochemical confirmation of hyperglycemia (fasting glucose or A1C). Common Associated Labs: Dyslipidemia: ↑ triglycerides, ↓ HDL, ↑ LDL. Possible hepatic steatosis on imaging. 5. Management (Exam Concepts) Lifestyle Modifications: Weight loss (5–10% body weight), healthy diet, regular exercise. First-line for all patients and may normalize glucose in early disease. Pharmacologic Therapy: First-line: Oral antihyperglycemics (mechanisms emphasized on PANCE): Biguanides (e.g., metformin): ↓ hepatic glucose output, ↑ insulin sensitivity. Other classes: SGLT2 inhibitors, GLP-1 receptor agonists, DPP-4 inhibitors, sulfonylureas. Insulin may be required for severe hyperglycemia or β-cell exhaustion. Monitoring: A1C every 3 months until stable (