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Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.

Write a query to randomly sample a row from this table.

Input:

<code>big_table</code> table

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>

Write a query to randomly sample a row from a big table.

Random SQL Sample

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

What is a key disadvantage of the F-test when compared to multiple t-tests?

What is a key disadvantage of the F-test when compared to multiple t-tests?

Hundreds of Hypotheses

You are testing hundreds of hypotheses with many t-tests. What considerations should be made?

Let’s say that your company is running a standard control and variant AB test on a feature to increase conversion rates on the landing page. The PM checks the results and finds a .04 p-value.

How would you assess the validity of the result?

Experiment Validity

Nigel Frank International Salaries by Position

Job DescriptionCurrently seeking a D365 CRM Software Engineer, with experience using Power Platform to join a forward-thinking team at a well established end user based in Manchester! This position offers the successful candidate the opportunity to take on a leading role in designing and developing Dynamics 365 CE enhancements - working closely with a like-minded team and applying your technical skills to have a significant experience on their D365 CE/CRM projects. My client is Manchester based and offers a flexible, hybrid working model with an excellent starting salary and benefits. Roles & Responsibilities<ul><li>Working on varied projects to develop and implement Dynamics 365 and Power Platform solutions.</li><li>Active role designing solutions and implementing configurations for Power Platform and D365 pushing the capabilities where needed</li><li>Bringing fresh ideas for improvements and influence how they are implemented.</li><li>Create and build solutions as part of an agile team, ensuring a collaborative approach to achieve exceptional results.</li></ul>Skills and Qualifications<ul><li>Strong experience with Microsoft Dynamics 365 CRM, including customisation's and configurations.</li><li>Proficiency in C# and JavaScript for plugin development and extending the platform.</li><li>Proven track record in automating business processes within D365.</li><li>Excellent problem-solving skills and the ability to collaborate effectively with colleagues and end users.</li><li>Understanding of the full software development lifecycle, with a keen eye for detail and quality</li></ul>Interested? Apply today for more details

Job Description Fantastic opportunity for a D365 Business Analyst to join an Leading Microsoft Partner working on Dynamics 365 CRM implementations across several diverse industries!My client is actively recruiting for this role due their organic growth and expanding project pipeline, they foster a positive team culture and an excellent opportunity for the right candidate to continue their career with Dynamics. Role + Responsibilities<ul><li>Engage with internal and external stakeholders to gather requirements, plan business process mapping and functional design.</li><li>Work closely with colleagues on all aspects of the end-to-end implementation cycle.</li><li>Provide support to the development team, helping with configurations.</li><li>Influence and involvement in UAT.</li><li>Delivery system training to key users.</li></ul> Skills + Qualifications<ul><li>End-to-end experience in D365 CRM implementations</li><li>Expertise in requirement gathering, process analysis, functional design, testing and training.</li><li>Excellent understanding of Dynamics 365 CRM/CE in particular Sales + Customer Service modules.</li><li>Confident communicator with excellent stakeholder and client engagement skills. </li></ul> Benefits<ul><li>Competitive Salary - up to £55k with company bonus structure </li><li>25 days holiday and company benefits including Pension and Life assurance. </li><li>Opportunity to collaborate with forward-thinking individuals working at one of the fastest growing Microsoft Partners</li><li>Exciting portfolio of projects across multiple industries using Dynamics 365 CE/CRM </li></ul> Keen to know more? Apply today for more details!

Senior Data Scientist - Manchester - Hybrid - £80k

Great opportunity for a highly experienced senior data scientist to join an expanding data team, giving you the keys to develop the data science side of their already successful data team! There will be a heavy focus on machine learning, ML engineering and predictive modelling. If this sounds like you, you could soon find yourself leading a team of data scientists!

Salary and Bonuses

Competitive salary of £80k + bonuses
Flexible hybrid balance - work 2 days in the office and the rest from home
Choose the days you come into the office based on your personal needs and work-life balance requirements
30 days annual holiday, rising to 35 days based on time served in the company
Free on-site gym, haircuts, and "social rooms" with entertainment

What do I need to apply

SQL: Advanced SQL use of Functions for Analytics, Recursive CTE
Python: Data set manipulations
Machine Learning: TF-IDF and linear Regression techniques
ML Engineering/Data Engineering background: ML Engineering will be a big part of this role
SQL Server: Some DBA knowledge would be useful in this role
Statistical Methods: Understanding of statistical tests, distributions, and maximum likelihood estimators.
Data Cleansing: Techniques for handling missing data, outliers and normalization
Communication: Ability to explain complex technical concepts to non-technical stakeholders
Problem solving: Analytical thinking and problem-solving skills

Please Note: This is a permanent role for UK residents only. This role does not offer Sponsorship. You must have the right to work in the UK with no restrictions.

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