NEURON CELLS

হঠাৎ বাসা ছাড়তে বাধ্য করা হলো, বিপাকে ছাত্রীরা ২২ বছরের মধ্যে বড় অবনতি বেতন বৃদ্ধির দাবিতে শ্রমিকদের বিক্ষোভ হাসিনাকে নীরব রাখতে বাধা ভারতের অভ্যন্তরীণ রাজনীতি

Why catching hilsa fish is banned in Bangladesh for 22 days in 2026? Hilsa a GI product of Bangladesh from 2017 will not be allowed to catch form October 8 to 29 for 22 days nationwide to create a welcoming environment for mother hilsa fish that migrates from the sea to rivers to spawn. Unfortunately, the situation of rivers are not welcoming for hilsa as several power plants are the threat like Payra Thermal Power Plant, Patuakhali Thermal Power Plant, Barishal Coal-Fired Power Plant.  The major breeding grounds include Barishal, Chandpur and Bhola which will be monitored strictly. The Bangladesh Coast Guard and the fisheries department will work together to implement the declared ban of not catching hilsa fish. The question will be about the situation of the fishermans involved in fishing as their livelihood. For this the government will provide VGF food assistance to fishermen during the banning time period.  One of the hindrances of hilsa production, the several power plan...

Higher Math Second Paper HSC Higher Math 2nd Paper CQ by Ariful Alam Abid

 Reverse arrangement 🙂 Go to the bottom and scroll up🙃

📘 Example: F-Test for Two Variances 🎯 Problem: Two factories produce the same type of product. A quality inspector wants to know if their product weight variances are different. The data: Factory A: Sample size Sample variance Factory B: Sample size Sample variance At a 5% significance level , test whether the variances are significantly different . ✅ Step 1: Set Hypotheses We are testing: (variances are equal) (variances are not equal) ✅ Step 2: Compute F-statistic Use the formula: F = \frac{\text{larger variance}}{\text{smaller variance}} = \frac{20}{10} = 2.00 Let: Numerator df = Denominator df = ✅ Step 3: Find Critical Values We use a two-tailed test at α = 0.05 → Each tail has 0.025. We need: Upper critical value Lower critical value From F-distribution tables: → so F_{0.025,14,11} = \frac{1}{3.21} \approx 0.311 ✅ Step 4: Decision Rule Reject if or Our F = 2.00 → Lies between 0.311 and 3.29 ✅ Step 5: Conclusion ...